Hornady Black Diamond .177 Caliber (4.5mm Diameter) BBs 5.1gr Anodized Steel 1500/Bottle $4.99 $4.03 Hornady Black Diamond .177 Caliber (4.5mm Diameter) BBs 5.1gr Anodized Steel 1500/Bottle are premium grade black anodized (coated) steel BBs manufactured by Hornady. The black anodized finish provides reduced surface drag and is made... Compare Out of stock