Available in clear or black, smooth inside and outside. Use on air compressor lines, blower lines, water circulation, and more. Flexible tubing has a temperature range of 5????F to 150????F. 3/8"- 1/2"black tubing has 1/16" all; 5/8"- 1"black tubing has 1/8" all thickness. Recommended Air Flow: CFM: 100 ft