Computer-optimized design gives these props a thinner profile and more #34;bite #34; 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. #34;C2 #34; design (see COMMENTS). SPECIFICATIONS Length: 9 #34; Pitch: 8 Thickness at hub: 3/8 #34; Hole diameter: 1/4 #34;