Phimosis rings are fitted according to their size. For small sizes, gently pull the foreskin towards the shaft to expose the phimotic band. Next, insert the small phimosis ring at 45 degrees then twist until the inner rim is inside the foreskin. For larger sizes, expose the phimotic band as before, fold the phimosis ring into a heart shape, insert the rim and release slowly so that 1 edge of the phimosis ring is inside the phimotic band.