Earring Backs Secure Kit, 200 Pcs Upgraded Safety Bullet Shape Earing Clutch Back, 100 Pcs Golden and 100 Pcs Silver Quantity: 200 Pcs or 100 Pairs Color: Silver(100pcs) and Golden(100pcs) This is new set of hypoallergenic earring backs, Alloy materials. Because these earring backs are hypoallergenic they can be used with gold and silver earrings without causing an allergic reaction Each clear plastic disc measures approximately 10 mm (7/16") in diameter