ITEM NAME:20Pcs Silica Gel Tube Damper Silicone O-Rings For 12AX7 Description: 100% brand new!!! Bile duct electronic tube special silicon vibration damping ring Resistance to high temperature of 240 ℃, non-toxic environmental protection Effectively reduce the electron tube vibration, microphone effect and reduce the noise, making the sound more clean Suitable for 12AX7/12AU7/ECC88 and other small diameter 20.5mm nine pin tube Specification: Compatible: for 12AX7 12AU7 12AT7 12BH7 EL84 Temperature range: 240℃ Material: Silica gel Diameter: 24mm Inner diameter: 18mm Color: Orange Using Method: Directly set on the tube body, the general set of three or four Package Includes: 20pcs x Silicone Rings SKU: DMO0014993652036672.Compatible: for 12AX7 12AU7 12AT7 12BH7 EL84. Bile duct electronic tube special silicon vibration damping ring. 20pcs x Silicone Rings. Material: Silica gel. Effectively reduce the electron tube vibration, microphone effect and reduce the noise, making the sound more clean.