Love the pitch and volume from these switches. Went from Sunset Gleam og and was a major upgrade in sound and stability. Was deciding between Yogurt S and Rosa Centifolia but went with the strengthened LY stem and it did not disappoint.
Description
Who It's For
Sound Profile
Review Video
Quality Assurance
HMX Rosa Centifolia Linear Switch
1 quantity = 10 switches.
HMX Rosa Centifolia is a factory-lubed linear switch designed by Rena Lab for a crisp, focused sound profile. Its strengthened LY stem and reinforced P7 bottom housing bring clear impact and a concentrated bottom-out, while the PA12 top housing helps preserve a lively response and smoothness without excessive harshness.
A newly molded light guide is made to better fit HMX dimensions, deliver more even RGB shine through, and support more efficient, consistent production. The result is a switch that aims for a bright, clean sound that stays composed—whether used in a foamless build or a fully dampened setup.
Highlights
- Available in 45g and 53g bottom-out options
- New L3 mold with a dedicated light guide
- Factory lubed for a smooth, controlled feel
- Designed for a crisp, focused sound: bright, but not scattered
Specifications
| Switch type | Linear |
| Designer | Rena Lab |
| Manufacturer | HMX |
| Mold | New (L3) |
| Stem material | Strengthened LY |
| Top housing | PA12 |
| Bottom housing | P7 (PA66 with 50% fiberglass) |
| Operating force | 37±2g / 45±2g |
| Bottom-out force | 45±2g / 53±2g |
| Pre-travel | 2.0mm |
| Total travel | 3.5±0.2mm |
| Spring | 22mm KOS single-stage extended |
Factory Lubing
Stem legs and sliders receive a very thin coat of 205g0. The spring and leaf are dry-film lubed; all other areas remain dry, including the bottom housing and the area around the stem pole. This approach is intended to maintain a clean sound and reduce the chance of lubricant pooling.
Product Overview
The HMX Rosa Centifolia is a factory-lubed linear keyboard switch designed by Rena Lab and manufactured by HMX. Its defining combination is a strengthened LY stem, PA12 top housing and P7 bottom housing specified as PA66 with 50% fiberglass. The current UniKeys listing also highlights a new L3 mold and a dedicated light guide intended to improve RGB shine-through.
The buying choice centers on two bottom-out weights, 45±2g and 53±2g, within the same 3.5±0.2mm total-travel design. That lets you choose resistance without changing the listed stroke length or material recipe. UniKeys positions the switch around a crisp, focused sound and describes it as clean, clacky and high pitched. It may suit a custom keyboard where you want a relatively short linear stroke and an expressive sound direction, with lighting as an additional consideration. Buyers who need a quiet environment or tactile feedback may find a different switch type more appropriate.
Feel, Sound & Build Character
Feel and weight choice
Based on the formal specification table, the two force pairs are 37±2g operating / 45±2g bottom-out and 45±2g operating / 53±2g bottom-out. Choose by whether you prefer less resistance or a firmer press; neither option introduces a tactile bump.
A compact full stroke
The 3.5±0.2mm total travel makes the stroke length an important comparison point. If you tend to bottom out, a shorter nominal stroke can bring the end of travel sooner than a longer-travel alternative. It does not by itself establish faster keyboard response.
Seller-described sound
UniKeys describes Rosa Centifolia as crisp and focused, with a clean, loud, high-pitched clack. The reinforced P7 housing and strengthened LY stem are part of that intended design. Material labels alone cannot predict your final sound: the plate, case, keycaps and damping still matter.
Key Buying Points
Two resistance choices
Choose a 45g or 53g nominal bottom-out option. The lower-force pair may appeal if you want less resistance; the higher-force pair provides a firmer specification to compare.
3.5mm nominal travel
The compact stroke is relevant if you want to reach bottom-out earlier in the key's movement. Compare it with a switch whose travel you already find comfortable.
Dedicated light guide
UniKeys identifies an updated light guide intended for more even RGB shine-through. Check your keyboard's LED placement and keycap design before planning the lighting result.
Targeted factory lube
The listed application covers stem contact areas and uses dry film on the spring and leaf. It gives you a stock-lubed starting point for the build.
What the Specs Mean
Operating force: 37±2g / 45±2g
These are the actuation-force values for the lighter and firmer options respectively. Compare actuation resistance separately from the force at full travel.
Bottom-out force: 45±2g / 53±2g
These values correspond to the 45g and 53g selector labels. They describe the force at the end of the stroke, which matters if you regularly bottom out.
Pre-travel: 2.0mm
This is the listed movement before actuation. It is a physical distance, not a latency measurement.
Total travel: 3.5±0.2mm
This is the full stroke, including the stated tolerance. Use it to assess whether a compact travel distance matches your typing habits.
Spring: 22mm KOS single-stage extended
Both force choices are listed with this spring description. Spring length alone does not specify the entire force curve or prove a particular return feel.
Bottom housing: P7
The table defines P7 as PA66 with 50% fiberglass. Compare this confirmed construction detail alongside the strengthened LY stem and PA12 top, rather than treating it as a sound guarantee.
Compatibility & Build Notes
The product photos show a cross-shaped keycap stem for comparison with MX-style cross-stem keycaps. The photos and current description also identify a dedicated light guide. These establish visible design features, not universal keyboard fit.
The current written specifications do not confirm a 3-pin or 5-pin footprint, confirmed hot-swap or solder PCB support, or a keyboard model compatibility list. Check your PCB's switch sockets or solder-hole pattern and the plate cutouts against the actual switch footprint before ordering.
The light guide is intended to improve RGB shine-through; the result still depends on LED placement and keycap construction. This mechanical linear listing does not establish Hall Effect compatibility. If your build has unusual switch requirements, obtain explicit fit confirmation first.
Who This Product May Suit
- Users who want a linear press with a choice of lighter or firmer resistance.
- Builders who prefer a 3.5mm nominal full stroke.
- Enthusiasts aiming for the crisp, high-pitched sound direction described by UniKeys.
- RGB-focused builds where the dedicated light guide can be assessed against the keyboard's lighting arrangement.
Who May Prefer Something Else
- Users who prefer a longer full stroke may want to compare a longer-travel switch.
- Noise-sensitive shared spaces may call for a quieter switch design.
- Typists who rely on a tactile bump may prefer a tactile model.
- Anyone requiring documented compatibility with a particular PCB should confirm fit before choosing this switch.
Use Cases in Real Builds
A lighter daily typing build
The 37±2g operating / 45±2g bottom-out option gives users seeking less resistance a defined force pair to compare. Its linear action and compact stroke may suit familiar typing habits after a small-sample evaluation.
A firmer linear setup
Choose the 45±2g operating / 53±2g bottom-out option if you prefer greater specified resistance while retaining the same materials and travel. This changes the weight choice without introducing a different switch type.
An illuminated custom keyboard
The dedicated light guide makes Rosa Centifolia relevant to a lighting-focused build. Check LED placement and keycap shine-through first, and use comparable recordings to judge whether the seller-described clack fits your intended sound.
Pack & Ordering Notes
One quantity contains 10 switches. Select the 45g or 53g bottom-out option, then count the switch positions in your exact layout. Include any desired spares and round up to a whole number of packs: a layout needing 84 switches requires at least 9 packs, providing 90 switches. Check the selected weight and current availability at checkout; this extension does not promise restock or shipping dates.
Frequently Asked Questions
Is HMX Rosa Centifolia a linear switch?
Yes. It is a linear mechanical keyboard switch designed by Rena Lab and manufactured by HMX.
What weight options does it have?
The table lists 37±2g operating / 45±2g bottom-out and 45±2g operating / 53±2g bottom-out. The selector identifies the options by their nominal 45g and 53g bottom-out weights.
How long is the travel?
Pre-travel is 2.0mm, and total travel is 3.5±0.2mm.
Is Rosa Centifolia factory lubed?
Yes. Stem legs and sliders receive a thin coat of 205g0; the spring and leaf use dry-film lubrication. The other areas, including the bottom housing and stem-pole area, are kept dry.
What materials are used?
The current table lists a strengthened LY stem, PA12 top housing and P7 bottom housing made from PA66 with 50% fiberglass.
Does it support RGB, and will it fit my PCB?
UniKeys describes a dedicated light guide intended to improve RGB shine-through. The page does not confirm the pin count or a supported PCB list. Verify the switch footprint, plate fit and LED arrangement for your keyboard.
How many switches come in one quantity?
One quantity contains 10 switches. Count your layout's switch positions, allow for any desired spares, and round up to whole packs.
Is it a quiet switch?
UniKeys describes it as clean, clacky, loud and high pitched. If low noise is essential, consider a switch designed for that purpose; the finished sound also depends on your keyboard build.
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Customer Reviews
Overall rating: 4.5 / 5 from 4 reviews.
Dry and clacky sound.
(board in video is the bachoo x osume nemui, POM plate, in top mount, with plate foam & osume tsukimi PBT keycaps) Lovely clacky switch, really enjoying the typing feel and sound. Despite having a higher pitched sound, I don't find them to be too loud and am able to work comfortably with them. I feel the video doesn't really capture the pitch of this IRL. If I had to compare the rosas to another switch, I personally think they are very close in sound to the yogurt S (which I also own), just higher pitched.
A very high pitched and clacky switch, even for HMX. Not the best for me, but still a very good switch.