DIY jewelry makers, this is for you! This pack includes 20 pieces (so 10 pairs) of stainless steel earring settings. They are blank bezel trays in a heart shape, designed to hold a 12mm heart-shaped cabochon (like a glass or stone gem). The metal is stainless steel 304, which is good quality and should be nickel-free and hypoallergenic for most people. Each setting has a post and clutch back included, so you have everything you need (except the actual cabochon!). You just drop your chosen 12mm heart-shaped stone into the bezel, secure it with glue, and you've made a custom pair of stud earrings. A super fun and affordable way to create unique jewelry. Just a heads-up: make sure your cabochons are exactly 12mm heart shape, as sizes can vary between suppliers and might not fit perfectly.