Iron, cast in two halves, nearly 3" diameter and weighing approximately 2 ½ pounds. Round fuse hole. Remnants of original gunpowder charge. This is from a crate of live grenades recently found buried while doing road work in a German city and dates to the Thirty Years War. The powder and fuse have been removed for safety and to allow transport. Early grenade predating the formation of organized "grenadier" troops.  This is the sixth one I've had from the same group and they've all sold quickly, so act now!