... carbon,middle carbon,high carbontensile trength:according to the customer requeststandard:ASTM,BS,EN,ISO,DIN,JISG,KSD,TOCT,DA,DS,OTEVA ... .Packing:coil,plastic spool,reel,bag,drum,carton or according to the customer ... used in bicycle ,motorcycle,funiture and electrical appliance. 0.3mm to 15mm spring steel wire