Description: Made of high quality zinc alloy. High-grade plating, beautiful, bright, not easy to be scratched. Large weight bearing capability: The weight bearing capability for 4 spikes is about 100 lbs (45kg). Heavy duty spike which can hold a large speaker easily. The stand feet is solid enough to support your big unit. Balance: Designed with highly-adjustable balance nuts. Suitable for speakers, amplifiers, CD DVD players, turntable recorders, cases, musical for instruments, etc. Improve the sound quality: Installed under the spikes on the floor speaker, it can protect the hardwood or tile floor from being scratched and damaged, while allowing the spikes to separate the speaker box from the floor, thereby improving the overall sound quality. Specification: Function: shock absorber. Material: Zinc alloy. Feet height: 25MM. Foot nail diameter: 28MM. Non-slip stickers: 3MM. Color: show as pictures. Quantity: 4 sets(each set include 1pc spike, 1pc slip mat, and 1pc double-sided tape). Note: There might be a bit color distortions due to different computer resolutions. There might be a slight error due to different hand measurement. packing list: 4 * Spike. 4 * Slip mat. 4 * Double-sided tape.