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 U.S.A. at Mueller"s world class copper mills.