This is 12 Gauge Winchester Supreme Elite 3" 375gr. Dual Bond Sabot Slug Ammo. This Winchester Supreme Elite Dual Bond slug offers a large hollow point cavity, which provides consistent upsets at a variety of ranges and impact velocities. The heavy outer jacket is mechanically bonded to the inner bullet. The inner bullet utilizes a proprietary bonding process which welds the lead core to a second jacket which results in a design that provides for a combination of knockdown power, solid penetration and significant tissue damage while retaining nearly 100% of the original weight. This round is for use in rifled barrels only. Muzzle velocity of 1850fps. This ammo comes packed in 5rds. per box.