Stainless Steel 3-Ring Combination Bit – 6? Shank 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. Now comes with black leather noseband and synthetic black curb strap (not as pictured).