Description: The speaker spike is made of high quality material, it is anti-oxidation, heat-resistant and durable. Each kit of the speaker spike consists of spike, basic pad and double-sided tape. It has good shockproof ability, so it will effectively protect the amplifier shockingly, It is easy to install, clean the floor at first and then apply it in a suitable place. Spikes can be installed to separate your players, amplifier or other audio components from vibration. Specification: Spike diameter: around 25-28 mm Spike height: around 28 mm Suitable for: amplifiers, audio equipment, etc. Package Includes: 4 x Speaker Spikes with Double-sided Adhesive Tapes 4 x Base Pads Note: Conversion: 1inch=2.54cm, 1cm=0.393inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!