These plain circular barbells can work with a variety of different looks. The simple design means you can wear it alone for a casual look, or build it up by adding more jewellery. These barbells come with ball ends in four sizes: 3 mm, 4 mm, 5 mm, and 6 mm. Additionally, it comes with either a 16 gauge/ 1.2 mm thickness, or a 14 gauge/ 1.6 mm thickness. There are also five diameters available: 6 mm, 8 mm, 10 mm, 12 mm, 14 mm. As a result, this versatile circular barbell can be worn in many different piercings. This includes: helix, rook, daith, septum, lip, eyebrow and nipple piercings.