The SIG Sauer Precision Steel BBs are engineered to provide reliable performance and smooth feeding across all .177 caliber / 4.5mm CO2 and spring-operated air rifles and pistols. Manufactured to tight tolerances, these highly polished steel spheres minimize internal barrel friction to preserve consistent velocities and tighter downrange groupings. The 5.4-grain weight offers an optimized balance of speed and impact energy, making it excellent for casual plinking, training drills, and reactive steel target practice. To ensure convenient field use, the BBs are housed in a heavy-duty, impact-resistant polymer bottle equipped with a secure, spill-proof flip-top pouring spout. This generous 2,500-count package supplies ample volume for extended high-speed shooting sessions without the hassle of constant restocking.