316L Surgical Steel Rose Gold PVD Double Ball Straight BarbellPrice Per Piece Material: 316L Surgical Steel Plating: Rose Gold PVD Sizing: For Nipple Rings. sizing is usually 1 2"(12mm) and up for the lengths and thickness is usually 14ga . Some customers also have their nipple piercing thinner at a 16ga For Tongue Rings. 1 2"(12mm) for the length is typically considered short. For the Thickness. tongue rings are almost always 14ga