For anyone who's ever lost an earring back mid-day or struggled to find a match for a favorite pair, this 670pcs set is a game-changer. Jewelry makers will love having 4 shapes on hand—butterfly backs for classic studs, lock-style for heavy dangles, flat for minimalist pieces, and bullet for hoops—ensuring every creation has the right fit. The 6-10mm sizes work with everything from tiny pearl studs to statement earrings, eliminating the hassle of hunting for compatible backs.​Daily wearers with sensitive ears will appreciate the skin-friendly rubber and silicone materials that avoid redness or irritation. The clear flat and lock-style backs disappear behind earrings, perfect for weddings or work events where you don't want backings to show. The reusable plastic case keeps each style separated, so you can grab a butterfly back for your morning studs or a lock back for your evening hoops in seconds.​Whether you're repairing a vintage necklace's earrings, restocking your craft room, or just keeping spares for the family, this set's ample quantity means you'll never run out. It's compact enough to tuck into a travel jewelry bag, making it easy to replace a lost back while on vacation. No more mismatched or flimsy earring backs—this set has every style and size you need.