Buy Anodized Initial Rings

Looking to manufacture anodized metal initial rings which can be laser engraved with initials. We need the rings to be flat on top and manufactured in different sizes. The attached picture is of a cut out initial ring. What we want is for the top of the ring to be flat so we can engrave it afterwards. We need the ring to be made inexpensively utilizing lighweight metal or aluminum. These rings are for kids.