[Xbonz]

The metal sphere, made from a proprietary metal alloy, will reduce the speed of a bullet by up to 80 percent while spreading out the point of impact on a target. So when it makes impact there’s less chance of it piercing flesh and causing serious internal injuries. Still, it hits the target with enough force to knock a person down, just like a non-lethal bean-bag round would, but with far more accuracy.

http://gizmodo.com/this-clip-on-hand...tha-1730039256