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, the surface rust tastes sweet and naturally stimulates the saliva production. This will cause the horse to salivate more, which in turn will encourage a better acceptance of the bit. The process of rusting (oxidation) changes the blue color of the TRUST bits to a brownish-grey. This is the desired effect of the Sweet Iron bits. If a Sweet Iron bit is not used for a while, an orange-brown rust layer may form on the mouthpiece. Simply remove this by wiping the bit with a damp cloth.

Sweet Iron bits are suitable for all horses. Sweet Iron helps the horse to salivate more, which will encourage a better acceptance of the bit.