8MM Black Carbon Fiber Ring with Cobalt - Size 12*Alternative metal bands cannot be sized. All of our alternative metal bands come with a sizing warranty. If you loose or gain weight, simply bring it back to John Thomas and we will get you the same band in a different size.* Check out this simply elegant ring in person at John Thomas Jewelers. We carry a large selection of high quality alternative metals in Albuquerque. This ring is made with carbon fiber and cobalt. Do you need a different size? We