The Korsteel Copper Roller Full Cheek Snaffles mouthpiece is made up of stainless steel and copper rollers, which prevents the horse from `grabbing` hold of the mouthpiece. The copper rollers help to increase salivation, which creates a softer mouth than with conventional single-metal bits. The main action of the Copper Roller Full Cheek Snaffle is on the tongue, the roof and the bars of the mouth. The single joint creates a nutcracker action which squeezes the tongue and can encourage the horse to raise their head. The full cheeks on this bit help to improve steering, however this bit is not suited to young and novice horses. This bit is very popular with horses who can get a little strong and heavy in the hand, and is widely used by many eventers and showjumpers. Ref: UTWB311