The PEX Pipe 3/8 Inch x 100 Feet Red Flexible Water Tubing SharkBite U855R100 PEX-B is a high-quality plumbing product made of cross-linked polyethylene material. This flexible water tubing has an outside diameter of 3/8 inch and an inside diameter of 3/8 inch, making it suitable for various plumbing applications. With its 100-foot length, this PEX pipe offers ample length for different projects, providing a reliable and efficient solution for water distribution systems.