Korsteel Copper and Steel Roller Mouth Full Cheek Snaffle BitWe love the Korsteel Copper and Steel Roller Mouth Full Cheek Snaffle Bit because the full cheek snaffle has narrow arms which project above and below the rings, preventing the mouthpiece from sliding in the horse's mouth and emphasizing the tuning aid. The copper rollers help to increase salivation and prevent the horse from taking hold of the bit. The single joint applies a nutcracker action that applies pressure to the tongue, the bars of the