Now you don't have to choose between feeling a square, circle, or double-stone vibe. This 3-pack of flat back studs has it all for the perfect touch to your earscape that you'll reach for every single day. Or wear all three at once to get the full effect. Plus, they're sensitive-skin safe and made without nickel, cadmium, or lead.Measurements:- 14K yellow gold plated, or rhodium plated.- Square stud: 5.8mm x 2.6mm; Circle stud: 3.2mm x 3mm; Double CZ stud: 4mm x 2.3mm.- AAAAA Premium Cubic Zirconia.