Welded steel pipe. Hot dipped galvanized meets ASTM A/53 standards. Schedule 40 standard pipe. Import. Each Pipe Nipple Is Individually shrink wrapped. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Nickel (Metallic)