Note:It's standard US-ANSI/UK-ISO layout, some non standard US layout mechanical keyboards can't use this keyset. Because the size of the Space Bar / Ctrl / Win / Menu and Alt keys are different. About SeMi Profile:the SeMi profile is lower than OEM profile, and higher than cherry profile, so the feel will be better, especially when you gaming. Description: → The color of the keycaps contain black, orange and beige; → This keyset is standard ANSI / ISO layout; → The thickness of these pbt keycaps is about 1.5mm, the height is SeMi profile, the material is PBT; → This keyset fit most 61 / 87 TKL/104/108 mx switches mechanical keyboards. But the size of the Space Bar / Ctrl / Win / Menu and Alt keys of some keyboards maybe different from this keyset, if you are not sure about the keycaps size of your keyboard, you can confirm with us. Keycaps Size: → Ctrl: 1.25u → Win: 1.25u → Alt: 1.25u → Menu: 1.25u → Space Bar: 6.25u If some keycaps are broken or missing when you receive the keyset, you can tell us , we will send these keycaps to you in time. See more