... The size and style are made by drawings.OEM & ODM accepted2.Material:Spring steel,stainless steel,zinc plating steel,etc ... ect.7.Package: general packing:inner polybag with export cartonspecial packing:as your request,but packing upcharge is needed, ... all kinds of springs,like brake spring,waved spring,tension spring,wire formed spring,compression spring,torsion spring ect.We also good provide hardware ...