This tubing is double dip crucible hand pulled tubing consisting of NS-143 Absinthe over Exp. #40 cadmium green. This is a first time, never been seen tubing produced as a very limited run. This glass is a very beautiful transparent green over a translucent cadmium green. We recommend pre-heating each tube in the kiln at 1050f for at least 20-30 minutes before using in the torch. This will ensure that there is no loss of tubing from thermal shock. Since the tubing is hand pulled, the sizing will vary in diameter, wall thickness & taper.