This O ring is huge. It is 2.5" in diameter. The strap is 1.2". It is made with a leather. The choker looks cool with crop top and striking high rise leather leggings(like the ones I have in my store :) or just any black tops and bottoms. It is also looking great with a black goth dress. It is good for punk clothing too. It will say, "Back Off!" to the person looking at you. :) You will be shocked to receive this choker. Because it is tremendously attractive! It has buckle on the back with holes. It is suitable for both girls and boys.