You are bidding on a set of 10pcs high quality, 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. The diameter is about 19mm. It can fit vaccum tube 12AX7 12AU7 12AT7 12BH7 EL84. Package includes: 1 x Tube Dampers Silicone O-Ring fit 12AX7 12AU7 12AT7 12BH7 EL84 10pcs for tube amp