1.Ensure good sound and vibration suppression of the door shock absorber 2.ISO9001:2008,PPAP 3 3.Anti-age More ... details about the shock absorber:MF male - female kind. Material nitrile rubber compound NBR ... ,COMPACTOR,BOMAG,SAKAI,BITELLIRAMMAX,DYNAPAC,STAVESTRO,etc2.ROSH certification 3.shock absorber rubber, anti-age4. Easy to install with threads male ...