RMB products a division of Enforcer RC Boats manufactures this aluminum die cast prop. Die casting is far more precise than any other form of metal casting so the prop is exact and strong for it's size and material make-up. Aluminum props are good for sport/performance model boating, and a good choice to test your boat and props at a fraction of the price of a brass or stainless steel prop. No real thinning is necessary, and it is not recommend that thinning is done as it will hurt the props integrity. Instead simply sharpen the prop blade edges to a dull but sharp finish. Balancing is extremely easy requiring a magnetic balancer and a small flat file, and can be done in a matter of minutes because of the low weight and precise manufacturing process.