[ materials] The silicone rubber used for metal door Muffler is , high temperature , good sealing performance, odourless, not easily deformed, safe and environmentally friendly, and can meet your long-term use needs [Good use effect]Using metal door can absorb shocks, reduce noise and loudness, and bring you a quiet environment [Easy to install] Simply align tip of with hole in door and squeeze in with a tool to complete installation, easy and quick [Dimensions]The bottom outer diameter is approximately 12mm/0.47inch, the upper cone diameter is 8mm/0.31inch and card height is 2.5mm/0.098inch; technology with a smooth, textured, burr-free [Adequate quantity]You receive 100 metal door silencers, sufficient quantity for your daily use and replacement needs. Color: Grey Material: rubber Package Contents: 100 * Door Handle silencers Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.