From the Bronze Armory: Thor Dark World style medallions. Made from designer resin and powder coated in faux silver, gold or bronze. The largest medallion is 4 1/2" inches in diameter. The next is 3 1/2" and the smallest one 2 1/2" inches in diameter. They fasten to your breast plate with two small screws that pass through the breast plate and secure in back with nuts and washers. Sold as a set of six medallions.