Features 1Silicone 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. Specification Features: 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 percent New Material: Silicone Gel Color: Orange Temperature range: 240 Diameter: Approx. 24mm / 0.9in Inner Diameter: Approx. 18mm / 0.7in Compatible: for 12AX7 12AU7 12AT7 12BH7 EL84 Fitment: fit for Suitable for 12AX7/12AU7/ECC88 and other small diameter 20.5mm nine pin tube Using Method: Directly set on the tube body, the general set of three or four Package List: 20 x Tube Damper Ring Package List