Copper, Size 7 Medium width of full well rounded section. Made of pure copper which is rare and specific to Vikings. Virtually all other cultures alloyed copper making bronze or brass for their enhanced properties. Vikings were accomplished metallurgists and held that metals had sacred properties. The use of copper here undoubtedly had spiritual significance. All items purchased are accompanied by a signed and dated Certificate of Authenticity with the name of the item and its unique item number for future reference. Certificates are suitable for display with your item, and can easily be mounted in a 8½" x 5½" frame. Our certificates are printed on an acid free 65lb cardstock. This means your certification will not turn yellow or deteriorate over time. FREE SHIPPING. NOTE: this vintage item will increase in its value each year. THIS IS AN AUTHENTIC PIECE OF HISTORY AND A VALUABLE COLLECTORS ITEM. NOTE: If interested contact me BEFORE purchase to see if this is still available. This Would Make An Awesome CHRISTMAS Gift.