1.875" nominal inside diameter x 13" long, approx. 3/16" wall with fiberglass resin plug in bottom. Weighs approx. 1 pound per tube.
Used to launch consumer festival ball shells (1.4G reloadables) which are 1.6-1.8 in. in outside diameter.
IMPORTANT: If your shells are smaller than 1.6 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. Colors may vary.