The Dreamland Pattern Printing Dye sublimation keycap for Cherry MX switch Keyboard PBT 104 .The unit contains 104 Keycaps that consist a gorgeous pattern and adopts the printing technology of integrate dye Sublimation the process uses the science of sublimation, in which heat and pressure are applied to a solid, turning it into a gas through an endothermic reaction without passing through the liquid phase. So,this one are both durable and reliable .Comparing with the material of ABS which adopted by normal keycaps ,we use the PBT to ensure the quality that is why our products won't be smooth easily.