... : black,blue,or other optionalSize: 35,40,2040,41,50,2050,50H,60,60H,80,80H,100,120...ROLLERSolid RollerMaterial 1035,1045 or ... 1050Through harden with surface and core 40-45HRCShot ... the specPLATE(Connectors, Links and Sides )Material 1045 or 1050Through harden with surface and core 39-45HRCShot peening per the spec roller ...