This is a keycap set purchased from the official Womier store. I've used it for a few months, but I'm selling it because I don't really like it. I haven't used it for very long, so I don't think there's any visible dirt, but please refrain from purchasing if you are concerned about minor imperfections. There are extra 1.25 size Command and Option keys for Mac, one of each. Keyboard Layout: US layout Material: PBT Profile: Low Profile Stem: MX style Legends: Backlight is not shine-through Model Name: Womier 144 Keys Low Profile PBT Keycaps Custom Slim MX Keycap