The comfortable leverback earring can be customized by using this sterling silver round 4 prong 3mm snap setting leverback. These earrings are easy to customize with sparkling components such as cubic zirconia. Simply push the stone down into the setting until it snaps into place and make sure the prongs are closed tight around it. The settings on these leverbacks will fit components that are 3mm in diameter. Leverbacks protect earring designs from falling out and are comfortable to wear. These leverbacks are SOLD BY THE PAIR and are not recommended for use with chatons.