The inner hubs are manufactured by the leading O.E.M. factory in Japan, The die cast alloy parts are machined to O.E.M. specifications and tolerance to be a direct and cost efficient O.E.M. replacement. The inner hubs can be used in combination with other Pro X clutch components like Pro X's hard anodized clutch baskets, pressure plates and heavy duty clutch spring kits or O.E.M. parts. It is no problem to use the Pro X inner hub with an O.E.M. basket, plates, or any other O.E.M. part. Made from die cast alloy Machined to O.E.M.