... 2.good abrasion resistance 3.high precision 4.good strength 5.alloy steel spur gear Nantong Runfeng Powder Metallurgy Co., Ltd. is ... --cleaning--vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T,100T,60T,25T,15T,10T,6T ... ,3T.5.high precision,100%quality with competitive price,good abrasion resistance ...