sweet iron loose ring eliptical 12 blue 125 mmSweet Iron bits are made of steel and have a recognisable blue colour. Sweet Iron develops surface rust through contact with (air) moisture which tastes sweet and naturally stimulates saliva production. The horse will foam more, which makes it accept the bit better. This rust development (oxidation) changes the blue colour of the TRUST bit to silver greyish to brown. The Sweet Iron bit will develop a thin layer of orange brown rust on the mouthpiece