Tiny square tragus stud, tragus jewelry, cartilage earring or helix piercing. The square disc is a tiny 3mm. Post is internally threaded, 16 gauge and available in 1/4" or 5/16" long with a flat backing. The square disc unscrews from the post and the earring is inserted from the back side of the ear or tragus. This is for one earring. Available in gold, silver, black or rose gold. Last photo is for sizing reference.