Professionals Choice Long Double-bar Correction Bit All cheeks pieces are stainless steel. All mouthpieces are sweet iron. These bits will rust when exposed to moisture. This creates a sweet taste in the horse's mouth and promotes salivation. Correction PCB-900 Mouth: 5" Cheek: 8" Provides great balance, smooth leverage application, and quick release. Correction: 4 moving parts allow the horse to respond to subtle rein pressure, reducing heavy rein handling. Copper bars keep the horse's mouth moist. 30 day warranty & Lifetime Guarantee on all Bits & Spurs.