5" Cheeks, 5" Mouth. This bit has light control and is excellent for training or relaxed pleasure riding. The small chain mouth conforms well to the bars and tongue making it comfortable for your horse to pack. Copper pacifiers are great for the nervous horse and encourage salivation. The chain mouthpiece is a good choice for a horse that likes to chew on the bit. The chain is hard for the horse to bite down on and play with. Also, because the chain conforms to the shape of the horse's mouth - the horse can move the links around on his tongue placing the bit in a more comfortable location - leading to a quieter mouth. The short gag action collects a horse very well. It helps to get your horse's legs underneath him and his hind end down. Designed to be used with a curb chain. Copper is a soft metal, check for signs of wear before each use.