All our tubes are made out of HDPE DR 11 Inside Diameter: 1.91" Outside Diameter: 2.40" Wall Thickness: 0.25" Length: 12" Our tubes will fit all Consumer class or class C fireworks shells. Any shells you can purchase at a tent or retail store will fit in our tubes. HDPE mortar tubes are the best for shooting your fireworks out of! All of our HDPE tubes are plugged with a 1.5"pine plug. Mortar tubes are to be used and securely placed in a mortar rack.