Fireworks Mortar Rack 28 Shot Fan Rack With 1.75" Fiberglass Mortar Tubes Fireworks Mortar Angle Rack 28 Shot With 1.75" Tubes Included. 1.91" I.D. Tubes Suitable for any 1.75" firework ball or canister shell. Tubes are 12.5" Length Overall FREE SHIPPING WITHIN THE U.S. ! NO FIREWORKS ARE INCLUDED. THESE CONTAIN ONLY FIBERGLASS AND WOOD.