Ill Glass Clear 17" 38mm Straight Tube with Slide and Gridded DownstemWith the smaller 38mm bore on these Ill Glass straights, it really gives a nice tight fit with a tube that has considerably less internal chamber space. Of course, all Ill Glass tubes have the signature 180 degree gridded downstem with sandblasted logo locked into place with a keck clip and a high airflow pinch bowl for maximum functionality even with the larger bowls. These tubes also have a sandblasted logo on the front of the tube and come with ice