... environmental, imported high-grade silicone materials, non-toxic, tasteless and harmless.2. Fully sealed design, waterproof, dustproof, oil ... can be used in any harsh environment and, can be disinfected and cleaned in water.3. can be ... , noiseless, soft5. According to its special design and manufacturing process, the rubber button has no metal nails ... temperature range from -40 to 80 rubber buttons