These Stud earrings are handmade with 4mm Crystals and Grade 23 Hypoallergenic Titanium. Choose from nine colors. Sold as pair. The crystals are lead free and feature a reflective backing for amazing color and brilliance. They are extremely durable and the post is "bend proof". Tiny and Classy! 4mm is about the thickness of two nickels (Please see reference photos). Comes with two sizes of Titanium backs for preference. Shipped in gift box.