E330 track roller, OEM no. 6y2795 1634149 1503987 Berco no.CR5897.
 The material is  50Mn/40Mn2,Special Boron-Manganese modified fine grain alloy to ensure  quality and consistencyuse Forging casting technique,
 "the surface Hardness is HRC50-56,deepth:4mm-10mm.Differential hardening process provides hardness in high wear areas and an elastic core to resist shock and impact loads"
 Uniform hardening to provide maximum wear life of track chains and rollers and to all of the components that are in frictional contact
 the warranty time is 2000hours or six months