Some push pins are bent in advance, if you found the push pin are straight, Pls BEND THE PIN SLIGHTLY following THE INSTRUCTIONS on the blue card you received. This earring is sold as a single piece, NOT A PAIR! Including one top and one post. The measurements are approximate! Bar Gauge (thickness): 20 gauge (0.8mm),Bar length: 5mm(SHORT!). Top size: 2.8mm diameter. Made of 316L surgical steel, pvd 18k gold-plated plated. 316L steel is the most basic metal used in body jewelry. It is the basic requirement of metal to be used in initial piercings and for healing. For most people this grade of steel works just fine. The push in design threadless piercing jewelry looks cute as piercing jewelry. Perfect for various piercings: tragus, cartilage, helix, lip, nose, earlobe, rook or other piercings it can fit. FANSING Trinity Ball Nose Rings for Women Men Surgical Steel Cartilage Earring Stud Threadless Labret Stud for Helix Rook Conch Tragus Earlobe Piercings 18k Gold-plated 20 Gauge 5mm Post