The snaffle bit is a standard jaw piece. This jawpiece has loose rings that allow the bit to move more freely in the mouth, so many horses accept this bit well. Because the rings move freely, aids come through less directly than with, for example, a snaffle bit. To prevent skins from getting between the moving rings, it is recommended to provide the bit with bit rings.
The double-jointed bit has two hinge points, is shaped more towards the mouth and lies a bit looser in the mouth. This bit acts on the tongue, the layers and the corners of the mouth. Be careful with narrow lower jaws, the hinge points can then press on the layers, which can cause wounds. Compared to a single jointed bit, this bit acts more on the tongue. A double jointed mouthpiece is a standard mouthpiece.
The Sweet Iron bits are made of steel and have a recognizable blue color. Sweet Iron develops surface rust through contact with (air) moisture that tastes sweet and stimulates the horse's saliva production in a natural way. This will cause the horse to foam more, which ensures better acceptance of the bit. This rusting process (oxidation) changes the blue color of the TRUST bits to brown-grey.