These well-crafted and attractive little devices are useful for a variety of applications. Placed under the spikes that can be fitted to floor-standing loudspeakers, they can hardwood or tile floors from being scratched and , while simultaneously allowing the spikes to decouple the speaker cabinet from the floor, improving overall sound quality. Especially designed for carpeted floors, where penetrating the weave of and reaching the plywood subfloor, spikes also contribute to improved sound quality on other surfaces, too by keeping 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 audio components from vibration.The tones 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 sure better contacted. Brass material promises high specific (density) Product diameter: 28mm Color: gold Material: Copper Package Contents: 40 x Speaker Spikes 40 x base 80 x stickers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.