Aluminum Tape Material Coated Aluminum Foil Length 75 ft. Paper Type Roll Diameter 4 In. Features Ez Zone(R) Tape Is A Purge Gas Retaining Tape Used To Seal The Root Gap Between Pipes To Trap Argon Gas. Composed Of Two Adhesive Sections Separated By A Two Inch Adhesive Free Center Zone. 3 Mil Aluminum Foil Coated High Shear High Heat Resistant Acryli Application MIG/TIG Welding Purging