The biggest shell available in 1.4G consumer class fireworks is a 3 inch shell. These shells are pre-loaded in the mortar tube and are usually sold as single shot tubes or in 9 shot racks. Three inch shells produce huge bursts that are nearly as impressive as some professional display fireworks. Keystone offers a great variety of single shot tubes and high performance finale racks featuring 3 inch shells. You can view our entire collection of professional-style single shot tubes and racks by clicking here.