Stainless Steel Studs for Cartilage, Nose and Lips Our Studs Include One of 3mm 4mm and 5mm Stainless Steel For the Sensitive Skin. 16 gauge 1/4 inch bar Stud Screws Off From on top To Make it An Easy Process When Inserting. Hypoallergenic and nickel free You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!