Power Tech Bravo Two Propellers are available in 3, 4 and 5 blade Stainless Steel. Power Tech Stainless Steel Propellers are cast in one integral piece in a ceramic mold. This process is used by all motor manufacturers as well as a few leading propeller manufacturers. The extra expense is well worth the outlay compared to the cheaper "weld-on blade" process. Power Tech Bravo Two Propellers are available with Rubber Hub Bushing.