Ice Vibe Cold Pack Boots Bombers Loose Ring Snaffle Ultra Comfy Lock Up Bit Magnesium is needed by horses Magnesium is needed by horses for proper digestion of starches and its presence is necessary for hundreds of enzymatic functions We recommend the reins to be treated with oil prior to the first use in order to protect and maintain the high quality of the leather Once heart rate slows to normal or near normal use vibration massage to encourage nutrients and oxygen into cells and tissues for repair and recovery as well as stimulating lymphatic drainage to reduce and potential inflammation Sold as a pair with a Right and a Left