4Ergonomics ergonomic ladder design smooth lines. 3PBT texture a little grainy feeling not easy to shine as ABS material. 2Color brighter and not easy to fade off. And it doesnt support light shining through. 1Made of PBT material a little grainy texture feeling not easy to collect fingerprints. 5PBT sublimation key cap the color has penetrated into the key cap the service life of up to ten years will not fade you can rest assured to use and enjoy the design on the key.