1.material:Aisi1010-1015 1045 1085 2.hardness:60-65HRC 3.size:1/4" 4.Grade:G500/G1000 ISO qulified company ... name1/4 inch steel ball for bicycle spare partssize1/4",3/16",5/32",1/8",7/32",5/16",7 ... furniture wheels,bearings for darwers,locks,grease,nipples,sliding,blocks,toys.MOQ 1Ton for each sizePayment terms1,TT 30% in adance ...