This screw hook nose stud is made from 9ct white gold and has a choice of three different sized crystals - 1.5, 2 or 2.5mm round. The cubic zirconia crystals are set in four prongs on a 20ga wire. These nose studs measure approximately 8.5mm from front to back. Their screw hook fastening ensures a very secure fit providing you with the confidence to wear these quality materials no matter what activities you have planned for the day!