17/18-2 / 71/72-2 Series,Traditional straight nose stud.
15/16-2 Series,Creative Foldasafe nose piercing stud,the sharp tip is folded ,no secondary injury
17/15 made of Surgical Stainless Steel 316F
18/16 made of 24K Gold Plate 316F
71/72 made of medical grade Titanium 316F.