8MM Cobalt with Carbon Fiber Ring - Size 10*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.* This amazing ring features black carbon fiber with a thin strip of cobalt. The width of this ring is 8MM. Check this ring out in person and see alternative styles at John Thomas Jewelers in Albuquerque. We are a top jeweler in