Underwood Ammos 10mm Auto 115-grain Xtreme Defender is engineered for those seeking high-performance handgun ammunition with proven design and construction. This round features a solid copper bullet and is loaded in nickel-plated brass cases, delivering speed and reliability for defensive and field use. 10mm Auto, 115-grain solid copper Xtreme Defender bullet Nickel-plated brass case for improved durability Muzzle velocity rated at 1700 feet per second With 20 rounds per box, this ammunition offers reloadable, non-corrosive cartridges that are lead-free and suitable for use in suppressor-equipped firearms. The Underwood Xtreme Defender line blends speed, energy, and modern bullet technology for versatile handgun performance.