This listing is for your choice of either 10 or 50 plain trays for round Cabochons made out of 316 Surgical Stainless Steel. This style offers a flat tray with a scalloped edge that is approximately 3mm tall. They are perfect as trays to make refrigerator magnets out of. You could also glue a brooch finding onto the back to make a lovely pin out of it! Available in 20mm at this time.