The standard size for belly piercings is 10mm, but a lot of piercings are bigger or smaller when healed, these belly bars are available with 6mm, 8mm,10mm or 12mm long bars(the actual pice of the body jewellery that goes through your belly piercing), we can make these belly bars shorter or longer as required, so if you need any other size please ask before ordering. The surgical steel top ball on these belly bars is 5mm and the bottom jewelled ball is 8mm.