This Spring Stainless Steel Hoop Ring is made with 316L stainless steel and is available in a variety of sizes (16G, 14G, 12G, 10G, 8G). It's an ideal accessory for septum and cartilage piercings, with inner diameters of 5/16" (8mm), 3/8" (10mm), or 1/2" (12mm). Durable and stylish, it's sure to complete your look.