The unique, free spinning SpinJag follows the rifling improving loading and cleaning for more accurate shooting with your muzzleloader. The SpinJag 2-in-1 will clean better, allowing the patch to follow the rifling thus making cleaning easier and quicker. The SpinJag 2-in-1 will also load better, allowing the bullet to spin and not damage the tip of your bullet. The SpinJag will load a variety of bullet shapes, from round balls to polymer tipped bullets. Note: If you shoot Parker Productions Ballistic Extreme or Match/Hunter this takes a different SpinJag