(25) 2" HDPE DR17 Mortar Tube - 15" length - 2.07" ID. The mortar tubes are plugged with a 1 1/2" thick wooden plug with four 1" staples in each tube. All mortar tubes are HDPE (High Density Poly Ethylene) - the standard for safety in the fireworks industry. Manufactured and assembled in America. Must be 18 & older to buy. These cannot be used with the 1.75" consumer shells. *Fireworks not included*