Round white plated brass jump rings with 6.5mm outer diameter, 4.7mm inner diameter. 0.9mm thick (almost 19 gauge). About 310 pieces (2.2 gross) per ounce. Plated brass, easy to manipulate. White plating is also known as "imitation rhodium" and "silvertone". Questions? Call our friendly sales staff at 1-800-366-2156, or email us.