Stainless Steel Loose Ring with Sweet Iron Comfort Snaffle Wide Barrel (MB 02, Level 1) Copper Inlay. This mouthpiece is made of polished Sweet Iron which naturally oxidizes or rusts. Harmless to horses, it has a sweet taste and promotes salivation.Legal for USEF dressage, FEI dressage and USEA eventing dressage. Consult organization's rule book for more information.