Material: Ebony Spike Diameter: 23mm (25.4mm=1in) Spike Height: 20mm Pad Diameter: 23mm Pad Height: 4mm Color:Black Self-adhesive film: 3M Ultra-thin Plastic for Spike Adhesive on the Speaker. Packaging include:3pcs Spikes + 3pcs Pads + 3pcs Self-adhesive film.Description1) 100% Brand New.2) Products Direct from the factory without original packaging.3) Function: Using isolation spikes is to suspend acoustic feedback from your speakers. Spikes can be installed to separate your players， amplifier or other audio components from vibration.The tones will be more focused. And less noise.4) Application: Set up the spikes beneath the equipment as same as the demonstration. No drill is needed. No adhesive substance is recommended， as it may influence the isolating effect.