20 pcs Silver Filled .925 Round 6mm Open Jump Rings 21 GA Gauge / 0.7mm Wire / Charm Connector / Findings / Bright Materials: 1/10 Silver Filled .925 Size: ~ 6mm (~ 0.7mm / 21GA wire) Quantity: 20 pieces Fine and new finished with clear cut. 1/10 Silver-filled, which means that the outer 10% of each item is .925 silver. Silver filled items have a brass core. The silver is mechanically bonded to the brass. Just like Gold Filled items, the result is much thicker than silver plating. This process make the headpins much less expensive than solid sterling silver, and the difference in quality is impossible to see with the naked eye.