Description About this Belly Bar with Shell Covered Butterfly The length of the belly bar is 10mm, which is the standard length for most belly piercings The belly bar is 1.6mm (14ga) thick which is the standard thickness that you are pierced with The top ball is externally threaded and is 5mm in size. The butterfly does not unscrew and is 12mm in size The Belly Bar with Shell Covered Butterfly is manufactured from Surgical Stainless Steel so will not rust, corrode or stain. The casing for the butterfly contains traces of brass. Surgical Steel jewellery is best for healed piercings As it contains traces of nickel it may not be suitable for those with nickel allergies