... 3.good durable 4.waterproof silicone membrane keyboard for person computer: Features of silicone membrane computer keypoard:1. Material: 100% FDA, LFGB, ... : -50~280 centigrade(°C)6. Appearance of the Tube: Wall Thickness of the tube is even ,smooth surface, no cracks,no ... air bubble,no impurity7.The charge of samples: need discussed8. Sterilized or not: non- ...