... is environmental, imported high-grade silicone materials, non-toxic, tasteless and harmless.2. Fully sealed design, waterproof, dustproof, oil-resistance, anti ... elasticity, noiseless, soft5. According to its special design and manufacturing process, the rubber button has no metal nails.6. Unique surface treatment ... to 10 million times8. temperature range from -40 to 80 rubber buttons