Cary 19mm ID 5mm Thickness Tube Dampers Silicone O-ring Amp For Shuguang 12AX7 12AU7 12AT7 12BH7 EL84 10pcs Condition: New Quantity: 10 pieces For Shuguang vaccum tube 12AX7 12AU7 12AT7 12BH7 EL84 ID: 19MM Thickness: 5MM