This labret features a 14-carat gold stud, which has the iconic marijuana leaf shape. The stud sits in a bio-plast bar. This is a bio-compatible plastic, which is perfect for people for metal allergies. Additionally, because it is slightly flexible they are very comfortable to wear. Although people typically wear labret studs in lip piercings, you can also wear them in other piercings. These labrets are 16 gauge/ 1.2 mm. As a result, they will also fit ear cartilage piercings. For example: helix, flat and tragus. Another advantage of bio-plast is that it can be cut to any size. So you can make them fit perfectly.