D-ring bit with dual function can be used as a straight mullen mouth or a mullen mouth with port particularly mouth-friendly made of soft, flexible plastic allows direct pressure transmission on the tongue and lower jaw provides lateral support when turning allows direct pressure transmission on the tongue and lower jaw due to the fixed mouthpiece no warranty for bite or teeth marks Description Very gentle on the horse’s mouth, made of soft, flexible plastic Can be used as straight bar or a bar with space for the tongue Mouthpiece is reinforced with a steel cable Food-safe, solvent-free, and contains no plasticizers The lateral contact helps horses that tend to fall out while riding or approaching an obstacle Allows direct pressure transmission on the tongue and lower jaw due to the fixed mouthpiece Available in 4 3/4", 5 1/8", and 5 1/2" Specifications: Thickness (16mm)