Rainbow Gradient Body Piercing 8G Captive Bead Ring Inner Diameter: Approximately 1.1cm Thickness: 8G Ball Size: Approximately 6mm Material details are unknown, but it is likely stainless steel with color plating coating. Recommended for those who understand that this is a pre-owned item, as it has been stored at home. Please note that there may be slight variations in color and size from the images. The price includes shipping and handling fees, so please refrain from negotiating a discount.