16"-18": Fits snugly at base of neck (choker style). Available Widths: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12.6mm. Clasp Type: Secure Spring Ring or Lobster Claw Clasp. Available Lengths: 16", 18", 20", 22", 24", 26", 28", 30".