AJR WHISTLE KIMBERWICKThe Whistle mouth features a round pipe mouthpiece with holes that accumulate saliva to keep the horse's mouth very wet and engaged. The straight mouthpiece is generally a strong mouthpiece when combined with the leverage Kimberwick cheek piece. This bit is ideal for horses that tend to be heavy in the riders hand and lean on the bit. Material: Stainless Steel Size: 135mm Mouthpiece Thickness: 18mm