The Xtreme Defender is based on the popular Xtreme Penetrator product line. The XD ammunition has an optimized nose flute, total weight, and velocity to achieve a penetration depth up to 18 inches* with a permanent wound cavity (PWC) that is just simply enormous; no other expanding hollowpoint comes close to achieving anywhere near this diameter and volume. Not only is the PWC over 100% larger than any other expanding bullet, expansion is achieved despite being shot through barriers. The solid copper body ensures that wallboard, sheet metal, and automotive glass will have no effect on the Permanent Wound Channel. *Falling within FBI guidelines Nickel-plated brass casings, our nickel plating process provides several key benefits, not limited to but including; improved feeding in all actions of firearms enhanced corrosion resistance over traditional brass, improved cosmetics, and ease of cleanup during reloading. Nickel-plated casings will not tarnish like brass during storage or when in contact with foreign materials such as leather, moisture, and other metals. As with all of Underwood Ammo™ rounds, we utilize flash suppressed powder so that your vision will not be compromised if it becomes necessary to use your firearm in low light. While taking advantage of our state of the art testing equipment, this high-performance ammunition is field tested using popular, real firearms that our customers are most likely to own out in the real world with all the elements you would experience. Specifications for Underwood Ammo 9mm Luger 68 Grain Xtreme Defender Platinum Edition Solid Monolithic Pistol Ammunition: Manufacturer: Underwood Ammo Caliber: 9mm Luger Number of Rounds: 20 Bullet Type: Monolithic Bullet Weight: 68 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 1700 ft/s Muzzle Energy: 436 ft-lbs Application: Self-defense Package Type: Box Primer Style: Centerfire Sectional Density: 0.08 Lead Free: Yes Width: 2.3 in Features of Underwood Ammo 9mm Luger 68 Grain Xtreme Defender Platinum Edition Solid Monolithic Pistol Ammunition: Improved Corrosion Resistance of the Copper: There will not be any oxidation (brown spots) or darkening of the copper projectile over time or extended storage. In aggressive applications such as wet, humid and even salt water, the coating will protect the copper from oxidation or verdigris.  This is very beneficial for self-defense ammo that is often purchased and stored for use for extended periods of time.  Improved Lubricity & Enhanced Feeding: The finish provides excellent dry-film lubrication that helps with feeding in all actions of firearms. The coating is very forgiving on modified guns since it reduces the friction of the projectile against the feed ramp as well as the chamber entrance.   Reduced Barrel Wear: The coating reduces barrel wear over a standard monolithic projectile. A permanent wound cavity (PWC) that is 2 times greater than any expanding bullet Reduced recoil Radial flutes that force the hydraulic energy inward to build pressure Minimal surface area to increase the force at the point of contact and sharp cutting edges that defeat barriers This ammo is a proven round for hunting. The bullet in this product does NOT contain lead. This round is designed to be supersonic and travels faster than the speed of sound. This product has been designed to be an effective choice for the ultimate in self-defense applications. SD is the ratio of an object's mass to its cross sectional area with respect to a given axis. It conveys how well an object's mass is distributed (by its shape) to overcome resistance along that axis. This ammo IS SAFE to use in a suppressor. Package Contentent: Underwood Ammo 9mm Luger 68 Grain Xtreme Defender Platinum Edition Solid Monolithic Pistol Ammunition