PAURO Men's Stainless Steel No. 13 Evil Skull Motorcycle Biker Ring Silver/Gold Lucky Number 13 Stainless Steel Ring with Skeleton Head Design. Size:US 7-14,Ring Face(Approx):23x26mm All of stainless steel ring are cobalt free and hypoallergenic, scratch resistant and comfort fit design. One of the ways to show off your love for your style is with a ring. Wear it at work or some special occasion, like halloween, party, ceremony. Each item will come with a FREE black velvet bag printed brand name "PAURO" on it.