Stainless Steel Loose Ring with Sweet Iron Snaffle (MB 09, 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.USEF dressage legal. NOT FEI dressage legal or USEA eventing dressage legal. Consult organization's rule book for more information.