These two new premium highly polished precision 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 two finish – copper coated and zinc coated, for more velocity, increased distance, better accuracy and high penetration. Packed 750 pcs. into metal box with screwable top.