5.5"Short Gag5 3/4" Mouth5 1/2" CheekApplies Even PressureBRB-100The distinctive feature of the gag is that the mouthpiece is designed to slide upward into the horse's mouth when the reins are pulled. Gag bits give the horse greater control over its own reward. When they give to bit pressure by flexing at the poll, tipping their noses or complying with whatever is required, the pull on the mouth lessens or stops.