If someone asks, then let's talk about axis selection and keycap selection. We have used almost all of Asus' unique axes for testing. And then combined with feedback from many posts on the internet. And based on the actual production volume, we finally chose the red axis. After selecting the red axis, we considered what kind of material, how much transparency it has, whether the lighting will be dazzling, whether the late night sitting atmosphere and light feel are suitable, and whether the material is prone to fingerprints, oily light, sweat, etc.