Why We Made It: Tie your look together with the Knot studs! Simple, chic, and versatile, these earrings can be worn anywhere, from casual to dressy. The Fine Print: Ouch-free and secure screw-back posts Free from: Nickel, lead, and copper Earring Dimensions: Post Length: 9mm Post Size: 20 gauge, .8mm Earring size: 6mm x 7mm