This is the PJA Series 15x6 Electric Beechwood Propeller from Xoar Int. FEATURES: Constructed of top-grade German beechwood Balanced during every stage of production Production process and measurement is certified to conform to aero sport equipment standard Processed from hub to tip minimize air resistance and balance air force Visually examined to ensure trailing edge symmetry INCLUDES: Xoar International 15x6 Propeller REQUIRES: Balancing before use, see COMMENTS SPECS: Diameter: 15" Pitch: 6" Hole Diameter: 0.31" (8mm) Weight: 1.05oz (30g) COMMENTS: Final balance check is suggested before flight due to external factors such as temperature. Handling during transit may vary the balance of the propeller. GX 2/22/11