Sig Sauer 4.5mm .35g Precision Steel BB Airgun Ammo - 2500 Rounds - The SIG AIR Precision Steel BBs are designed for use with compatible 4.5mm/.177 caliber airguns. Made from zinc-plated steel, these BBs weigh 0.35g each and come in a 2500-count bottle for extended shooting sessions. Features 4.5mm / .177 Caliber; Zinc Plated Steel Construction; 0.35g BB Weight; 2500 Count Bottle; - At Sportsman's Warehouse, we live for the thrill of the great outdoors. Whether you're hunting, fishing, camping, backpacking, or shooting, having the right gear is key to making every moment unforgettable. That's why we bring you only the highest quality, trusted brands-because your outdoor experiences deserve the best. From expert advice to quality gear and community events, Sportsman's Warehouse is more than a store-we're your partner on every journey. Come explore with us and experience the difference passion makes.