The Grainger 16NH25 is a 10 inch wide sheet of copper with a mill finish. It is 0.032 inches thick and comes in packs of 3 sheets. The copper has 99.9% minimum copper content. It meets ASTM B152 requirements. The sheets can be used for custom fabricated parts, shims, spacers, prototypes, and small production runs. They provide good thermal and electrical conductivity.