Each container includes 100 aluminium balls. Hornady 6mm ARC Ammo Review: Make Your AR-15 a Tack Driver 100 - 0.50 caliber Aluminum Ball Pure Al Solid Balls High Accuracy & Performance: Smooth surface and consistent size ensure tighter groupings and improved shooting experience., Improved compatibility (12., 5mm): Specifically resized from 12., 7mm to 12., 5mm for optimal fit with . 50 caliber pistols, including HDR50 and HDP50 models. 50 caliber HDR50, HDP50, and compatible pistols - no more jamming or forced loading. Solid Aluminum Build: Crafted from pure, high-grade aluminum – each ball is precision-machined for balance, speed, and impact. 11 Joule UK Premium Aluminum Balls In 50 Caliber – 12.5mm Precision-Machined Solid Aluminum Ammo The resized format ensures smoother chambering and reduced jamming compared to larger 12., 7mm alternatives. China 5mm Aluminum Balls Manufacturers, Suppliers - Factory Direct... Solid Aluminum Balls - 12., 5mm (. 50 Cal) for Compatible Pistols These 12., 5mm diameter aluminum projectiles are designed for reliable use with.