Iron+chromeplating, various design and size. Nickel, Silver and Gold colors. Non-Nickel can be safe for pets We have good source for this product, thickness of ring can be 2mm-3mm, one layer or double one. Round, Flower, heart-shaped, various choice. The Diameter size of ring can be from 10mm-50mm. Color can be made to order. If need special requirement or Brand on the ring, also can do.Design ...