Copper Metal Stamping Blanks! Free Shipping on orders over $30 and $2.50 Standard Shipping everyday! Shop our stamping blank assortments in copper and brass. 18 Copper Round Stamping Blanks. 6 - 1 1/2 inch, 6 - 1 1/4 inch, 6 - 1 inch, made from 24 gauge metal. These soft copper blanks are great for stamping, engraving and etching. Copper metal blanks and are perfect for making jewelry, charms and other metal crafts! Get three popular sizes in one convenient package at Craft Making Shop.