2PD10  This is a plastic ring for holding small spheres or eggs.  It is 5/8″ in diameter x 1/4″ tall.  It will work for small spheres, eggs or marbles from about 5/8″ to 1 1/4″.

The Sea Jasper egg shown measures 1 3/8″ X 1 3/4″ (Sea Jasper egg is not included)