Features1Silicone vibration damping ring, having excellent damping effect. 2Resistance to high temperature of 240 , non-toxic and eco-friendly. 3Effectively reduce the electron tube vibration. 4Suitable for 12AX7/12AU7/ECC88 and other small diameter 20.5mm nine pin tube. 5Easy and convenient for installation, having stable performance.SpecificationFeatures:1. Silicone vibration damping ring, having excellent damping effect.2. Resistance to high temperature of 240 , non-toxic and eco-friendly.3. Effectively reduce the electron tube vibration.4. Suitable for 12AX7/12AU7/ECC88 and other small diameter 20.5mm / 0.81in nine pin tube.5. Easy and convenient for installation, having stable performance.Specifications:Condition: 100% Brand NewMaterial: Silicone GelColor: OrangeTemperature range: 240Diameter: Approx. 24mm / 0.9inInner Diameter: Approx. 18mm / 0.7inCompatible: for 12AX7 12AU7 12AT7 12BH7 EL84Fitment: fit for Suitable for 12AX7/12AU7/ECC88 and other small diameter 20.5mm nine pin tubeUsing Method: Directly set on the tube body, the general set of three or fourPackage List:20 * Tube Damper RingPackage List