It is made of high-quality foamed silicone rubber material and adopts anti-aging technology to ensure long-term service life at high temperatures. Large deflection, aging resistance, good elasticity, and good vibration absorption. Type: 20 PC case fan mounting silicone screws; material: rubber; color: black; length: 30 mm; maximum diameter: 11 mm. It is used to slow down the vibration generated when the fan is running, isolate the resonance of the PC case, and reduce the overall noise. The most popular fan installation type for various brand computers. The universal design is suitable for most open PC chassis fan sizes, and the installation is quick and easy.