This low ported barrel mouth provides plenty of room for the horse's tongue to pass underneath, and when engaged does not rotate onto the tongue. The center barrel has limited movement to prevent the bit from scissoring down into the tongue or up into the palate. The copper roller provides some movement helping to pacify the nervous horse. Argentine cheeks offer versatility, hooking reins to the middle rings offers direct rein pressure or moving reins down to the teardrop rings and adding a curb chain provides leverage.Features: Stainless steel cheeksLow port mouth provides space for tonguePivots at port connection points for more movementCopper inlaid roller gives horse some additional flavor without the risk of pinchingStage B (Transitional - Switching between neck and direct reining)6'' Cheeks5'' MouthMouth Diameter: 3/8''Mouth Material: Stainless SteelMouth Type: 3-Piece, Low Port, Ported, Roller, Roller Barrel, SmoothPort Height: 3/4'' Port.Color:Stainless Steel/CopperSize:Horse