These bracelets are given as a prize to those who won a tournament. They are defective and can only be used by idiots. Unlike other bracelets they are worn by the students, not the avatar. There are two known iron bracelets. One can create a summoning field without a teacher present and the other can split their avatar in half.
These bracelets are given to students for surpassing a certain grade and are worn by the avatar. They can only be used when fighting in the subject the student used to gain the bracelet.