Price is for one single piece you will receive a single piece per a order ( Not A Pair or Not Two Pieces) about 5.5mm Inner Diameter :(out diameter: 7.5mm Ring Thickness : 1.2mm) about 7.5mm Inner Diameter :(out diameter: 9.8mm Ring Thickness : 1.3mm) about 9.5mm Inner Diameter :(out diameter: 12mm Ring Thickness : 1.4mm) about 11.5mm Inner Diameter :(out diameter: 14mm Ring Thickness : 1.4mm) Pin Thickness : 0.8mm (about 20g) Material : 14K Real Gold, Whitegold Plated 14k Gold, 14K Rosegold