Avila Sweet Iron Twisted Ring Snaffle The sweet iron has a very appealing taste for the horse. The size of this twisted snaffle will offer a lot of feel in a horse’s mouth, while remaining very gentle. Weighted rings encourage a lower head carriage. Mouth: 5 ¼", Rings: 3" This bit will rust when exposed to moisture. This creates a sweet taste in the horse's mouth and promotes salivation.