Robart Pinch less Walking Horse Bit Robart Patent #6449930 A revolutionary idea and bit design to implement it. Instead of training and working a horse on the basis of creating pain and the anticipation of pain, the patented David Robart bit corrects by pressure and eliminating the pain. Truly a cleaver design. A great bit for all gaited horses. Allows control of gaited horses especially loose gaited horses. Encourages horse to relax in mouth. Note: not recommended for sensitive tongued horses. Size: 5.