HERE THEY ARE- twenty side port rings cut by my clever cousin Ric on his new CNC machine. The idea is that I can cut a perfect hole in the upper bout of a uke and glue one of these into the hole then sanding it down to perfection leaving a sound hole with a lovely contrasting piece of wood around it. I sent Ric pieces of Walnut, Koa, Honduran Rosewood, Box wood and Maple. The sent me back the above mixed bag of colors and woods from which to make my selections. The little tabs on the bottoms are easily sanded off. I predict success with these perfect ovals of lovely wood.
This photo will give you a size reference. I am pleased with the size. Looks good on a tenor Uke.