3 Ring Happy Tongue Bit Sweet Iron - 135mm3 Ring Happy Tongue Bit SWEET IRON 135mm Mouthpiece: Solid Happy Tongue curved ported design for tongue relief. Sweet Iron Composition: The blue sweet iron oxidizes with use, promotes natural salivation, helping to keep the horse's mouth soft and responsive. Cheek Style: 3 ring Dutch gag for variable leverage. Action: Mild on the mouth with optional rein placement for increased poll pressure. Best For: Sensitive mouthed horses Polo Forward horses