Belly banana bar this fantastic anodized 316l steel belly banana bar is a great piece of jewellery for a navel piercing it is 16mm wide 10mm in length and has 5 and 6mm balls that open and close on a screw fit 316l steel is a low carbon version of 316 stainless steel and because of its low nickel content is generally considered hypoallergenic for most people making it suitable for most peoples piercings belly banana bar anodized 5 6mm balls 316l steel screw on ball