These barbells are made out of Medical Grade Titanium and internally threaded (which means that the ball and disc have a thread which is screwed into the hole in the bar). Internally threaded jewellery is easy to insert into piercings and less likely to cause any irritation when fitted because the whole bar is smooth. The disc is available in 2, 3, 4, 5 or 6mm and both the disc and ball have a 1.2mm thread. The barbell is 1.6mm (14 gauge) in thickness and available in 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 30mm, 34mm, 36mm, 38mm or 40mm lengths. Available in a choice of Titanium colours, the ball, barbell and disc will be the same colour.