This is the PJA Series 17x6 Beechwood Propeller from Xoar International. 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 17x6 Propeller REQUIRES: Balancing before use, see COMMENTS SPECS: Diameter: 17" Pitch: 6" Hole Diameter: 0.31" (8mm) Weight: 2.15oz (61g) 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. jxs 04/28/10 ir/jxs