Specification: Product Name O Ring Material Silicone Outside Diameter 155mm / 6.1" Inner Diameter 150mm / 5.9" Thickness 2.5mm/ 0.1" Color Red Weight 3g Package Content 1x O Ring Description: Features high temperature industrial duty red silicone tube dampeners. It fits for vacuum tube to stop noise and rattle of the tube. Made of silicon and not get hot and burn up. These are used in shocks, absorbing vibration, and many other uses.