1. Silicone material, non-toxic and odorless, has excellent wear resistance, not easy ageing, bright color characteristics, more than ordinary plastic has good protective and functional. 2. All buttons and ports are easy to access. 3. Simple, comfortable, easy to carry. 4. It adequately protects devices from the normal scratches, dirt, tear and wear. 5. All kinds of pens can be easily erased with dry paper towels.Silicone material, non-toxic and odorless, has excellent wear resistance, not easy ageing, bright color characteristics, more than ordinary plastic has good protective and functional.