Spring and tine Features: 1) Material: 60Mn, 60Si2Mn 2) Process: heat treatment 3) Hardness: 40-50HRC 4) All kinds of springs for Harrow \ combine harvesters \ Tedder \ Rake \ Baler \ Cultivator \ mowers, like spring tine, torsion spring, press spring, pull spring and nylon tines... 5) Colors: self-colored, any electrophoretic color, chromated or as requested