2. material : YG6, YG8, YG6X 3. features : high hardness, even up to HRC95 , quite high resistance of rustiness and rot 4. we can provide you any size sintered carbide ball you need, guarantee to you the Grade range you required , also the quantity . 5. usage : mainly used in office hardware , machine just as punch, drill , hardness test and so on 6. a bit of samples are not free