When I thought I was a "purest", I used only wood. They would break, I'd replace them, they would break, I'd replace them. Get the idea. Lately I'm perfectly happy with a good APC say 11-6. That APC prop is a good prop. They're some kind of fiber/nylon molding. From Tower's description. Computer-optimized design gives these props a thinner profile and more "bite" with less noise. Lightweight molded nylon construction reduces rotating mass for higher output and longer life. Reinforcing carbon fibers help maintain true, constant pitch at any rpm. A nylon/fiber prop will also break, but seems like I get luckier more often.