Original Civil war era exploding cannon ball mortar round. I assume that since it is hollowed out for the charge that if it were solid it would weigh 12 pounds.The round itself measures 4 1/2" across and the inside of the hole that would have taken the fuse for the charge measures 7/8". The item "Civil War era 12 lb Exploding Cannon Ball Mortar Round Possibly Confederate" is in sale since Monday, July 10, 2017. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Artillery Gear, Equipment". The seller is "losttreasurestoo" and is located in Pawtucket, Rhode Island. This item can be shipped worldwide.