This is a 100-foot length of LLDPE (linear low-density polyethylene) tubing with a 1/2 inch outer diameter (OD) and 3/8 inch inner diameter (ID). It has a working pressure (wp) of 153psi at 70 degrees Fahrenheit. It is also NSF 51/61 certified, meaning it is approved for use with food and drinking water applications. LLDPE tubing is known for its flexibility and resistance to impact, puncture, and environmental stress cracking. It is often used in applications involving potable water, food and beverage processing, and chemical transfer.