http://www.skylighter.com/ http://www.skylighter.com/hdpe-mortar-tube-rack-festival-ball.html This is an angled mortar rack, with 1.91 ID x approximately 15 inches long mortar tubes with wooden plugs in the bottom of each. Use these for consumer festival ball shells (reloadables) which are 1.88" in outer diameter or smaller. IMPORTANT: If your shells are smaller than 1.75", use TU2100 spiral cardboard tubes. Firing too small a shell from too large a tube can cause a low-break. Low breaks can cause personal injury or fires being started. http://www.skylighter.com/mall/product-details.asp?id=600 1.88 ID x 15 inches (nominal) long with wooden plug in bottom. Use these for consumer festival ball shells (reloadables) which are 1.75-1.87 inches in outside diameter. IMPORTANT: If your shells are smaller than 1.75", use TU2100 spiral cardboard tubes. Firing too small a shell from too large a tube can cause a low-break. Low breaks can cause personal injury or fires being started. http://www.skylighter.com/mortar-tubes-fiberglass-festival-ball.htm 1.9375" nominal inside diameter x 12.5" to 14" long, approx. 1/8" wall with fiberglass resin plug in bottom. Weighs approx. 1 pound per tube.<br/> Used to launch consumer festival ball shells (1.4G reloadables) which are 1.75-1.91 in. in outside diameter. IMPORTANT: If your shells are smaller than 1.75 in., use TU2100 spiral cardboard tubes. Firing too small a shell from too large a tube can cause a low-break. Low breaks can cause personal injury or fires being started. $4.67 per tube. <br /><br /> <a href="/fireworks/how_to_make/20_shot_festival_ball_mortar_rack.asp" target="_new" rel="nofollow">Learn how to build a 20 shot rack</a>.<br /> http://www.skylighter.com/3-inch-hdpe-mortar-tube.htm 3" ID x 18 inches long with wooden plug in bottom. Weighs approx. 3 pounds. Can be used with PL2050, PL1050, PS2030 shells. http://www.skylighter.com/3-inch-fiberglass-mortar-tube.htm 3" ID x 18" (+/- 1/4") long, approx. 1/8" wall, with fiberglass resin plug in the bottom and structurally reinforced lip to prevent fraying. Weighs approx. 2 pounds.<br /> Use with PL2050 or TU2233 shells. Firing too small a shell from too large a tube can cause a low-break. Low breaks can cause personal injury or fires being started. http://www.skylighter.com/4-inch-fiberglass-mortar-tube.htm 4.125 ID x 22 inches long, approx. 1/5" wall, with fiberglass resin plug in the bottom and structurally reinforced lip to prevent fraying. Weighs approx. 4 pounds. Color may vary.<br />Use with PL2060 shell. Firing too small a shell from too large a tube can cause a low-break. Low breaks can cause personal injury or fires being started. http://www.skylighter.com/mortar-tube-4-inch.htm 4" ID x 24 inches long with wooden plug in bottom. 4 inch ID x 24 inches (nominal) long with wooden plug in bottom. Weighs approx. 4 pounds. Can be used with PL2060 shell. Firing too small a shell from too large a tube can cause a low-break. Low breaks can cause personal injury or fires being started. http://www.skylighter.com/6-inch-fiberglass-mortar-tube.htm 6 inch ID x 36 inches, approx. 1/4" wall, long with fiberglass resin plug in the bottom and structurally reinforced lip to prevent fraying. Weighs approx. 10 pounds.<br/> Use with PL2080 shell. Firing too small a shell from too large a tube can cause a low-break. Low breaks can cause personal injury or fires being started.