This 14 gauge Forbidden Body Jewelry PTFE barbell is flexible, comfortable and 100% metal free. PTFE is a safe, hypoallergenic and comfortable alternative to Titanium and Surgical Steel body jewelry. It is an ideal solution for individuals with metal allergies who still want to enjoy and show off their piercings. It is also suitable for medical procedures that require metal-free jewelry, such as MRIs and various surgeries. The acrylic glitter end balls measure 5 mm and they each unscrew for easy use.