1. Round silicone seal ring with high precision 2. 100% high quality silicone 3. durable, non-toxic and eco-friendly Round silicone seal ring with high precision1. Material:100% high quality silicone.2. Features:high and low pressure resistance,oil resistance, nontoxic, eco-friendly, safety and healthy.3. Temperature range: -40C to 230C.4. Colors :any pantone color is acceptable.5. Size: can be ...