TOAOB 10 Pieces sterling silver Hypo-Allergenic Butterfly Safety Earring Backs 3.78x4.85mm These earring backs are good quality, quite sturdy,10 Pieces Silver 3.78x4.85mm Butterfly Friction These work great for replacements to ANY earring, the hole in the center is universal and fits all earrings from childrens, to teenagers, to adults These as they are smaller than standard backs that is comfortable and helps earrings stay flatter to the back of my earlobes and prevent that droopy look, allowing for a tighter fit Because these earring backs are hypoallergenic they can be used with gold and silver earrings without causing an allergic reaction Small size package, easily portable so they'll be there when you need them. Never worry about losing those earring backs again