This stainless steel eggbutt snaffle bit has a 5" solid mouth and 2-3/4" rings.
A snaffle bit is a direct pull or direct action bit, meaning that when you are holding the reins in two hands atop your donkey, you have direct contact with its mouth. Whatever you do with your hands, your donkey should do. Most trainers will start a young donkey in a snaffle to gain the framework it needs to transition to a curb bit. Or, in the case of donkeys, continue to use the snaffle.