A.The .700 OD pipe that we sell is made in the U.S. using the finest top-quality resins from Union Carbide (DFDA 7510 base resin and Union Carbide approved carbon black concentrate resin) - the industry's recognized best drip tubing materials. These products are specifically designed for use in drip irrigation tubing and are manufactured to provide outstanding resistance to both environmental and thermal stress cracking. The manufacturer also conforms to ASAE S435 standards for inner diameter and wall thickness tolerances, which mean the pipe will fit very well with standard .700 fittings. We do not sell the .700 pipe in longer than 100' due to size of packaging.