... ,sprocket, helical gears,valve, pistion,rod guide,rotors,sintered parts Ningbo Kingbell Powder Metallurgy Co., Ltd. is a Sintered Metal ... metallurgy components, which have more than 1500 items, including structure parts which have complex shapes , high mechanical & physical performance and ... are awarded Ningbo High Tech Enterprise in 2005. On Jun.2,2008,we have the certificate TS16949. Ningbo Kingbell/ ...