Question: how to figure out the size of your belly button ring?
Answer: To find the size of your curved barbell you need to measure the inner length between the two balls (or jewels) in a straight line. As previously indicated, the barbell length will be between 6mm(1/4inch) to 12mm(1/2inch). 10mm(3/8inch) remains the most common barbell length for a belly button piercing.