7.3 Grams Each Round, Much Heavier And More Powerful Than Rubber Balls And Plastic Kinetic Projectiles. First Class Aerial Aluminum Alloy Made. Compatible with Byrna SD/LE Launchers And Umarex T4E HDR68/ HDS68/HDX68/ HDB68. Significantly Round, Solid, Hard, Smooth, Seamless With No Flaws. Never Get Jammed. Uniform Size of .68 Caliber. Fly Straight And Far, Hit Hard And Accurate, Great for Target Practice And Self-Defense. Very Reusable, No Shattering With Steel Targets. No Deforms When Hit Concrete Blocks Or Plywood.