Shires Sweet Iron Copper Roller Snaffle BitWe love the Shires Sweet Iron Copper Roller Snaffle Bit for the raised copper ribs that help prevent the horse from taking too much hold. With a sweet iron mouthpiece designed to produce a sweet taste and encourage salivation as it oxidizes. The addition of copper ribs help to prevent the horse from taking to much contact, a good deterrent for horses that tend to take hold. The double jointed mouth with rollers is good for horses with busy mouths.