This is a very unique ear gauge/captive ring. It is a acrylic captive ring connected by a barbell. The barbell measures 16 Gauge with a length of 22mm - 7/8 of an inch. The captive ring measures 8mm thickness with a diameter of 18mm - 3/4 of an inch. The Barbell is 316L Surgical Steel. The Ball size is 4mm. The Captive ring is made of acrylic material. The entire piece is nickle free.