These Zinger Wood Props are made of Lightweight Maple. Props with Larger Diameters Greater than 16 inches, are Made from Heavier Maple. FEATURES: All Wood Props, feature classic Squared Tips and Ample Airfoil Sections. The Latest in Engineering Technology used for this Updated Design. Lower Noise and Accurate Balance Available in a Wide Array of Sizes to Suit Every Application. Propeller is totally fuel-proof. INCLUDES: One 11x5 Wood Propeller SPECS: Center Hole Diameter: 3/16" approx. Propeller Diameter: 11" Propeller Pitch: 5"