Surface to Air www.surfacetoairaccessories.com I bought this ring for my husband, but it's unisex. I would even borrow his, but I bought one for myself (ring below) They also have three finger rings. I got him the polished one.
I bought this one for myself from Etsy. (StarsForSydell is the seller). I love this ring it has a little jewel on it. I got myself the oxidized one because I wanted it to look a little different from my husbands.