?PBT Keycaps?For this model we adopts PBT material, made through a process of dye sublimation, ensures long lifespan without fading away. The texture is detailed and feels supreme, the surface is dry and not easy to get oily. Plus the replacement keycaps, you can fully enjoy the creativeness from AKKO team ?Programmable with AKKO Macro V 1.0 ?Not only being N-Key rollover, you can also program the keyboard with AKKO Macro V 1.0. It fully meets your customization needs. Moreover, it has build-in LED slots for future modification if you want more stunning backlighting effects