... helical gears,valve, pistion,rod guide,rotors,sintered parts, shock absorber parts Ningbo Kingbell Powder Metallurgy Co., Ltd., has ... specialized in manufacturing items of sintered metal parts for 20 years. We have TS16949 certificate in Jun.,2008. ... sintered metal parts below:1.) Pistons, Foot Valves, Rod Guide for Shock Absorbers or Dampings of Automobiles; 2.) Gears , Helical Gears, Bevel ...