99% pure copper made to ASTM standard B-88. Type L is the standard wall thickness for pressure applications. Annealed for ready bending. I.D. measurements apply to type L tubing. Heavy wall for general plumbing and heating purposes. Available in 1/4", 3/8", or 1/2" x 20' coils. The boxed packaging of the Mueller short cut copper program provides for a clean and organized method of merchandising these items. Due to the fluctuation of the copper market, Do it Best Corp. reserves the right to bill at the prices prevailing on date of shipment. No firm quotes available.