Crosman Copper-Coated 4. 5mm BBs provide reliable and consistent performance with almost any 4. 5mm-caliber BB air rifle or air pistol. Available in "EZ-Pour" bottles for quick and easy reloading in pack sizes of 1500-count to 6000-count. Ideal for those just entering into the BB air rifle/pistol sport, for marksmanship skills development and backyard BB plinking enthusiats. Made of quality materials, "Take It Outside" with Crosman.