Keygeek M1 switch is another unique addition to the Keygeek linear switch family. The reason is that M1 is manufactured using Keygeek's new stem mold, which consists of 7 smaller spheres on the stem tip.
Comparing it to other classic stem tip designs that Keygeek has such as waffle stem tip (Y2 switch) or spherical stem tip (Y3 switch), the 7 spheres stem tip comes with a firmer and more solid bottom out feel.
Sound wise, the 7 spheres stem tip creates a loud and thocky sound profile for the M1 switches, which is also quite different from the spherical stem tip and waffle stem tip which are designed for a quieter and deeper bottom sound.