It's A Pack of 25 Counts .68 Cal Hard Aluminum Balls. Crafted From Top Class Aerial Aluminum Alloy. Fits Perfectly for Umarex T4E HDR68/ HDS68/HDX68/ HDB68 and Byrna Series(SD/LE/EP) Launchers. Can Be Recovered And Reused Over and Over. 7.3 Grams Each Ball. Much Heavier And More Powerful Than Rubber Balls And Plastic Kinetic Projectiles. Silver/ Black Coated Color, Smooth Finish, Seamless, Mirror Polishing For Super Precise And Significantly Round. Fly Far and Fast ,Hit Accurate and Hard.