BICYCLE FREEWHEEL 1.Full stell ball, good quallity 2.16T,18T,20T,22T free whell 3.steel material 4.Hardness:HRA65 BICYCLE FREEWHEEL1.Full stell ball, good quallity2.16T,18T,20T,22T free whell3.steel material4.Hardness:HRA65 5.Freewheel is hard-tempered 6.One piece in one poly, then in one box Bicycle free wheel