Package included:50 Pcs fan anti-vibration screws cooling PC fan. Material:Rubber, Color:Black, Size:Approx 43 x 7.4mm (L*Max Dia). Universal-Design:PC case fan mounting silicone rubber screws fits most fans, reduce the noise between the fan and case frame. Function:Silicone rubber pin rivet mounts screws better than normal screws, replace box fan fixing screw, reduce box resonance caused by fan vibration. After Sale Service:If you are not satisfied, please feel free to contact us for replacement or full refund within 30 days.