These -crafted and attractive little devices are useful for a of applications. Placed under the spikes can be fitted to floor-standing loudspeakers, they can hardwood or tile floors from being scratched and daed, while simultaneously allowing the spikes to decouple the speaker cabinet from the floor, improving overall sound . Especially designed for carpeted floors, where penetrating the weave of and reaching the plywood subfloor, spikes also contribute to improved sound on other surfaces, too by any cabinet resonance from "exciting" the floor and creating a "boomy" sound. Function: Using isolation spikes is to suspend acoustic feedback from your speakers. Spikes can be installed to separate your players, amplifier or other o components from vibration.The tones will be more focused. And less noise. Application: Set up the spikes under the equipment . No drill is needed. No adhesive substance is recommended, as it may influence the isolating effect. Screw to adjust the spikes make better contacted. Brass material promises high gravity (density) Product diameter: 28mm Material: copper colour: gold Package Contents: 4 x Speaker Spikes 4 x base 8 x stickers Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.