The smallest key on the planet, this old-fashioned skeleton key is ready to unlock your heart (via your ear, of course). A Cords Club exclusive, we designed this flat back stud from scratch. We spent months perfecting the size, weight, and color of this gorgeous stud! This listing is for a single ASTM F136 implant grade titanium push-pin flat back stud. Measurements:  18 GA (1mm) Post is 1/4 inch (6mm) in length, with a 4mm disc on back.  Approx. size of front piece is 8x3mm Refer to listing images to get an idea of the size of the stud on-ear. Check your own ear measurement before ordering Materials: 18K PVD Gold Plated Titanium, Titanium, zirconia Care: Water and tarnish proof with proper care. If exposed to salt water, chlorine, or lotions/perfumes, rinse off with cool-warm water and gently dry. When not wearing, store in a dry, cool place. Do not pull, twist, or tug on your jewelry.