4PCS 30*10mm Aluminum Alloy Amplifier Feet Shock Absorber Amplifier Pads Feet Silver Features: Made of high-quality aluminium alloy, fadeless and not easy to oxidize. To raise the height of amplifier to help create a real stereo surrounding sound. Amplifier feet to help absorb shock, to protect your amplifier. Rubber ring is detachable, very convenient and easy e. Durable for a long-time use. Specification: Type: Amplifier Feet Color: Silver Material: Aluminum Alloy Diameter: 30mm Height: 10mm Screw hole diameter: 4.5mm Surface treatment: Anodizing sand blasting Rubber ring: Detachable Weight: Approx. 58g   Package list: 4 * Amplifier Feet Note: Please allow slight error due to manual measurement. Thanks for your kind understanding. Installation Method: The  amplifier feet can be installed from the inside of the chassis, or it can be installed from the outside of the chassis with self-tapping screws (suitable for wooden materials, self-tapping screws need to be self-matching, which means it's NOT included), or for 3M double-sided adhesive (self-matching, also NOT included)