ITEM NAME:5X(100mm x 96mm x 2mm Red Silicone O Ring Oil Seal Seals H7E2) 5X(100mm x 96mm x 2mm Red Silicone O Ring Oil Seal Seals H7E2) 5X(Product Name: O Ring; Material: Silicone Outer diameter: 100mm / 3.9 inches; Inner diameter: 96mm / 3.8 inches Thickness: 2mm / 0.079 inches Weight: 2g Silicone supports a wide temperature range and has excellent resistance to weather and ozone. It fits vacuum tube to stop noise and rattle of the tube. Made of silicon and not hot and burned. These are used for dimmers, absorbed vibration, and many other uses Package Content: 1 x O Ring Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.).It fits vacuum tube to stop noise and rattle of the tube. Made of silicon and not hot and burned. Silicone supports a wide temperature range and has excellent resistance to weather and ozone.