Weaver Leather Gag Bit, 5" Sweet Iron Mouth with Copper Roller, This stainless steel gag bit features a 5" sweet iron mouth with copper roller and 8" cheeks. Depending on the degree of slide on the gag, these bits aid in lifting the shoulders, allow more flex for turning and provide more control at a higher rate of speed, making them popular for barrel racing and other speed events. These bits should be used with a loose chain curb. Please note: Horses should never wear a bit when tied.