This item can be purchased individually or as a 4 pack , please make your selection. Each surgical steel barbell measures: 14 Gauge (1.6mm), Length: 5/8" (16mm), Ball: 6mm, CZ Gem 5mm. Lightweight and comfortable to wear. Set comes with: steel silver, goldtone, rose goldtone and black barbells. Entire piece is nickel free. An amazing value. Order yours today!!