This lead-free, 100% copper-constructed bullet provides extreme penetration every time. Typically, this premium hunting bullet retains 100% of its original weight even after smashing through dense tissue and heavy bone. The Triple - Shock bullet design incorporates a series of precisely positioned rings cut into the bullet's body. These grooves relieve firing pressure, allowing the TSX to be safely loaded to higher velocities while reducing copper fouling. The bonus is that this is one of the most accurate hunting bullets you can buy. Mfg: Barnes Bullets