The swivel cheeks on the side of this bit ensure that the bit is located still and stable in the mouth and cannot be pulled through the mouth. The swivel cheeks put pressure on the cheeks, emphasizing the rider's steering aids. These properties make this bit a good choice for young horses.
A full cheek snaffle can be ridden with cheek straps. These hold the bit in place and give it a light leverage. All cheek snaffles have an extensive description that helps you choose the right bit for your horse.