"Punch when not equipped"
When equipped, the Expert's Ring allows Link to attack with his fists. As long as Link does not have an item equipped in either the 'A' or 'B' button slots, Link starts punching when the corresponding button has been pressed. Link's punch when holding this ring does equivalent damage as that of the Noble Sword.
When Link punches while having the Expert's Ring equipped, an explosion sound effect can be heard.
The Expert's Ring is nearly identical to the Fist Ring. The only difference is that the Expert's Ring is significantly more powerful than that of the Fist Ring.