Forbidden Body Jewelry is pleased to be your go-to resource for all of your piercing jewelry needs. These Forbidden Body Jewelry basic barbells are used for a variety of piercings for men and women. To help our valued customers choose the right jewelry, we'd like to share some information about several common piercings and their standard gauges & suggested lengths. The piercings we will go over are tongue, nipple, and various cartilage piercings, but these can be used for surface piercings as well as intimate piercings and more. These are merely suggestions, and we strongly encourage measuring length and confirming personal gauge size to ensure an accurate fit prior to purchase. For tongue rings, 14 gauge is the most common size and 16mm is the standard length; 12mm is typically considered short for the tongue and 19mm would be long. For nipple piercings, 14 gauge is the most common gauge size and the bar length generally ranges from 12mm to 22mm; because nipples vary so much in size, measurement is required to ensure a perfect length choice. These barbells can also be used as cartilage earrings. Tragus earrings, helix earrings and conch earrings are typically 16 gauge or 18 gauge, and 8mm is the standard length. For these, 6mm would be a slightly shorter option and 10mm would be the longer option. The anti tragus is usually 16 gauge or 18 gauge, and takes either a 6mm or 8mm bar. We are always updating our selection to bring you a variety of the best new body jewelry available. You can reach out to our Customer Happiness Team any time - our friendly team members look forward to assisting you!