Material: special high quality silicone. Waterproof, can be dipped into and washed with soap and water The colorfast printed letters won't come off even after long periods of time. Bright, eye-enjoyed and smooth surface,very excellent hand feeling. Type quietly and comfortably. It can be rolled up randomly and taken easily Lightweight, ultra-slim, and compact. It fit easily in your briefcase, backpack, or notebook Flat design also offer an ease in typing which eliminates negative-angle stress to your wrists. High strength and high flexibility Small size, airproof, innocuous, dustproof, shockproof, acid and alkali proof, no distortion in both low and high temperature