These labrets have a square cubic zirconia stone stud, which comes in four sizes: 1.5 mm, 2 mm, 2.5 mm and 3 mm. The stone is held in a beautiful 14-carat base. This stud fits into a bio-plast labret bar. Bio-plast is a bio-compatible plastic, great for people with metal allergies. Additionally, since it is slightly flexible, bio-plast is very comfortable to wear. These labrets are 16 gauge/ 1.2 mm, which will fit in ear cartilage piercings as well as lip piercings. For example: helix, flat and tragus. Another advantage of bio-plast is that it can be cut to any length you need. So, you can ensure they fit perfectly. These studs come in a clubs shaped display, which holds 24 labrets (6 labrets of each stone size).