Set of 4 pairs of Butterly-style earring backs (8 pieces total) compatible with our .925 sterling silver and 18k gold vermeil earrings. Two sizes available Small: compatible with most stud earrings, smaller hoops, huggies, and more.  Large: compatible with larger hoop earrings, baroque drop styles, and more.  Want to mix sizes or metals or have a question about compatibility? Email us at customerservice@agmesnyc.com.