Features: Hight quality,high temperature silicon tube dampers; It fits for vacuum tube to stop noise and rattle of the tube. Made of silicon and not get hot and burn up; The inner diameter of the damper is about 19mm; high quality, high temperature industrial duty white silicone tube dampeners; It can fit vaccum tube EL34 EL34B 6V6 6SN7 6N8P 6P6P and other tubes as matched as this diameter; Advising:2pcs for each tube; Inisde Diameter:28mm; Coil Diameter:4mm Package Included: 8pcs x 28mm Tube Dampers Silicone O-Ring Fit EL34/EL34B/6V6/6SN7/6N8P/6P6P Audio Vaccum