X-Treme Bullets Copper Plated Pistol Bullets are made of premium materials in the United States to deliver downrange performance with every shot. X-Treme Bullet's process starts with a lead billet extruded into wire then swaged into a core. Cores are copper plated and then restruck once more. Though uncommon in the industry, the restrike produces more uniform bullets with more precise diameters and smoother finishes for superior performance. Made in USA. Swaged core Copper-plated Precise diameters Smooth finishes Premium components