The Williams Bomber Blue Bit cheek piece allows for many rein positions. If attached to the main ring, the bit acts as a loose ring. When attached to the bottom ring it promotes pole flexion by creating more positive poll pressure. Additionally, The Williams cheek piece helps to prevent drifting.The Bomber Blue is a unique bit which produces amazing results for the majority of horses.Ported mouthpiece for improved tongue relief.The material used allows the bit to remain light and it promotes salivation.It is particularly well suited to horses that object to metal mouth pieces.Noteworthy, due to the nature of the material, it can easily be marked by teeth. Therefore, lifetime guarantee does not apply to these bits if used.