The Port allows enough room for the horse's tongue to fit comfortably under the flattened area of the port. Relaxation and chewing are a common reaction to this bit which is perfect for horses that won't tolerate tongue pressure who often react with excessive head shaking. The 3-Ring combines effective restriction, leverage and pull effect in one bit. The level of control depends on the different rings which changes the length of leverage. The 3-Ring is often used to test the horse's reaction to leverage but when used with a second rein it is similar to a regular Eggbutt or loose ring snaffle.