Bit guard
The bit guard are fixed on both sides of the bit between the ring and the horse's mouth. They protect the horse's mouth from the risk of pinching that some bits can cause. Most often made of rubber, there are thicker or thinner models to fit your horse's mouth.
![Bit Guard - Mors and More](https://www.morsandmore.com/c/762-small_default/bit-guard.jpg)