1.Material:50MN 2.Good wear resistance 3.Good quality sprocket ... EX100,EX120,EX150,EX200-1/2/3/5,EX220-1/2,EX270-1,EX300-1/2/3/5,EX400-1, ... EX450-5,UH063,UH07-5/7,UH083KA TOHD400-2/7,HD450,HD512,HD550-1/5/6/7, ... HD700-5/7,HD770,HD820,HD850,HD1250-2/7KOBELCOSK60,SK100,SK200,SK220-3,SK220-7,SK230, ... SK07N2,SK300-2,SK310,SK320SUMITOMOSH120,SH200,SH216,SH220,SH260,SH265,SH280, ...