Trust Sweet Iron Medium Port Full Cheek BitTRUST bits are anatomically shaped. The balance between shape, material and weight is constantly taken into account. TRUST bits are slightly curved so that they are better shaped towards the horses mouth. Because of this anatomical shape, the bit lies better in the mouth and the pressure is better distributed. The Sweet Iron bits are made of steel and have a recognizable blue color. Sweet Iron will rust when it comes into contact with (air) humidity,