Features: Reduce fan to vibrateNoise reductionExtend the life of computer accessoriesEasy to use. good elasticity, larger deflexion, aging resistant and good vibration absorptionQuick and easy to fitcolor: BlackMaterial: rubber1.rubber screws for open corner cooling fan. We use premium materials so these rubber screws are softer and better noise and vibration dampening.2.compatible to mounting hole sized at 4.3 to 4.8mm diameter, extremely convenient for mounting and unmounting cooling fans, also great for reducing noise and vibration caused by cooling fans.Package Contents:50 x Computer damping 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.