This can be used as both an earring & a piercing because of the bar’s thin thickness ( 0.7 mm ). Each order includes a single piercing. Material: 14k Solid Gold, Cubic Zirconia Color: Yellow Gold Size: CZ 2mm, CZ 3mm Post Bar Thickness 0.7mm Post Bar Length 6mm Ball Screw Back 3mm All jewelry comes in a gift-ready box. 14K Solid Gold 2mm 3mm Cz Stud Earring, Dainty Screw Back Tiny Minimalist Birthday Gift