Material: Butterfly sterling silver earring backs is made of 925 sterling silver (925 embossed).Sterling silver earring posts is made of solid brass plated silver ; safe, non-toxic.Prevent allergy. Stronger than pure silver ear pins
925 Earring Posts and Backs: Using these products, you can perfectly DIY earrings. Earring back fits most earrings
【Earring Supplies for Jewelry Making】 The DIY earring supplies contains earring posts and backs besides the charms for earring making, which can be applied to make all kinds of stud earrings, as well as to repair your favorite earrings or other jewelry
The package includes: Earring making kit comes with 50PCS 8mm earring pin studs, 50 Pcs butterfly earring backs,50PCS rubber bullet earring backs