There are thousands of different bits on the market today. They still only have two basic methods of control, straight pressure bits (snaffles) and leverage bits (curbs). If it is listed as a snaffle it will use pressure on the bar of the mouth. If we list it as a curb it will be a leverage bit that requires the use of a snug-fit curb chain or strap. The mouthpiece you need will depend on the space of the interdental area and the palate height. If you don't see the bit you need, be sure to contact us.