steel BB shots 4.5 mm/. 177 BBs are precision made to exacting standards to give the maximum accuracy, power and performance in Co2 / air pistols & rifles that are designed to use steel .177 BB’s. Comes in four finish – copper coated , zinc coated,golden coated,black coated, for more velocity, increased distance, better accuracy and high penetration.
Steel shot is nearly round and does not deform in the shotgun or when it strikes birds. Steel's more aerodynamic shape than lead shot creates shot strings that are smaller in length and diameter, delivering more dense patterns.
plastic usually measure around 6 mm (0.24 in) in diameter (though selective models use 8 mm), and weigh 0.20–0.40 g (3.1–6.2 gr), with the most common weights being 0.20 g and 0.25 g, while 0.28 g, 0.30 g, 0.32 g and 0.40 g BBs are also commonplace.