Ring for men made out of ceramic featuring a carbon fiber insert. This ring is part of Madani collection. The width of this ring is 9 mm. Jewelry made from ceramic isn't made from the same ceramic you find in most craft stores. The ceramic is actually called Hi-Tech Ceramic and it is the same ceramic used as a heat guard in space shuttles. The shine and smooth appearance lasts for a lifetime. Hi-Tech Ceramic is hypo-allergenic so not to worry if you are allergic to any specific metals. All Madani products are sold with a lifetime warranty against any manufacturer defects in material or workmanship starting from the date of purchase. The exclusions are damages resulting from an accident, lack of care and/or normal wear and tear.