Bodu Thin & Clear TPU keyboard Protector Cover for Lenovo Thinkpad E531,E540,E555,S5,S531,T540P,W540 Made with durable non-toxic, Premium-grade TPU material with amazing 0.18mm thickness Compare to Silicone material, this TPU cover is much more thin and higher transparent Engineered to fit precisely to your keyboard without obstructing keyboard backlight Provide full protection for your keyboard against dirty, such as liquid spill and dust Completely washable and reusable, soft durable material to ensure comfortable usage while typing