2½ Ring Buster Roller – Sweet Iron Bit - 135mm2 Ring Buster Roller Sweet Iron Bit 135mm Mouthpiece: Double jointed with center buster roller. Material: Sweet iron encourages salivation and bit acceptance. Clean and dry after each use Surface rust is expected and enhances taste for most horses Store in a dry place to preserve finish. Cheek Style: 2 ring light leverage with lift. Action: Fast pressure and release response on the tongue and bars. Best For: Strong, quick horses Forward rides