Sweet iron mouthpiece Copper ribs Double jointed mouth with rollers Cheek height: 65mm Sweet iron mouthpieces are designed to oxidize to produce a sweet taste Rust resistant Easy to clean The roller in the centre creates an uneven surface, which increases the bit's severity 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 deterent for horses that tend to take hold. The double jointed mouth with rollers is good for horses with busy mouths.