6" Cheeks, 5" Mouth. The Argentine Cheek has always been a great choice and continues to be highly popular. The only thing that can improve upon this age-tested design is Reinsman's Sweet & Sour mouthpiece! Like a green apple dipped in molasses, the combination of copper and sweet iron are very appealing to the horse, with the added bonus of increased salivation - making for a softer mouth. A highly versatile bit, it is a good transitional choice for introducing curb pressure and is a great everyday riding bit with its average shank length. Copper is a soft metal, check for signs of wear before each use.