A basic snaffle bit is used to transition from a ring or snaffle to a curb or leverage bit. These use a small amount of curb and shank pressure. the cheeks move independently for more lateral flexibility. Great for training.
A nice trail bit but you do have to have soft hands. My 8 year old barely needs a twitch.
This is a great bit, whether you are training a horse, or just a trail bit. The only catch is you need to have gentle hands with it. If you don't, this won't be the bit for you and it will end up ripping your horses mouth appart.