Rocket Pellets.The Rocket Superior Accuracy and Penetration airgun ammunition combines our performance lead with a hardened steel tip to yield enhanced penetration and shock with precision accuracy. The Rocket enhances down-range performance without any sacrifice of accuracy and consistency. Consistency, uniformity and performance are what makes Gamo ammunition superior to all others. Specifications: - Caliber: .177 (4.5 mm) - Velocity (fps): 866 - Kinetic Energy, (ft x lbs): 18 - Paraffin Penetration, (inches): 1.75 - Paraffin Expansion, (inches): 0.29 - Pellet Weight (grain): 9.6 grain - Per 150.177 Cal, Per 150