20' coils. 99% pure copper. Annealed for ready bending. O.D. measurements apply to refrigerator tubing. Available in 1/4" and 3/8" x 20' coils. Mueller Industries dehydrated refrigeration coils are made to ASTM standard B-280. The copper tube is cleaned, nitrogen urged, capped (with standard yellow caps) and shrink-wrapped to an air tight seal. The boxed packaging of the Mueller short cut copper program provides for a clean and organized method of merchandising these items. These products are proudly Made in the U.S.A. at Mueller's world class copper mills. No. D04020P: 1/4" O.D. x 20' No. D06020P: 3/8" O.D. x 20'