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8mm wide domed Serinium ring. Comfort fit rounded edges. Serinium is a cobalt and chromium based metal. This scratch resistant metal will keep its brilliant bright white finish. It is hypoallergenic. It will not oxidize, tarnish or discolor. It is easy to remove in an emergency. It is twice as hard as cobalt and stronger and more durable than tungsten. This ring is covered by a lifetime limited warranty and size exchange policy.