Bowsmith Premium Plus+ tubing is manufactured from the highest grades of polyethylene resins. Contains a minimum of 2% carbon black. Every reel undergoes a series of tests to insure Bowsmith's high quality manufacturing standards are met. Available in a wide range of diameters, wall thickness and coil lengths to accommodate required lengths of run, working pressures and terrain. Pre-punched and marked custom spacing are available for easy Fan-Jet microsprinkler or Non-Stop emitter installations. Manufactured in Exeter, California and Avon Park, Florida. Seven-year warranty back it all up.