Trust Sweet Iron single-jointed eggbutt bradoon 12mm

Bradoons are always used in combination with a weymouth bit. It's mainly used in the higher dressage classes and only suitable for very experiencend riders. The rings of a bradoon are smaller than rings of a normal bit. The reason for the smaller rings is to create enough space for the weymouth. You'll need a double bridle to be able to ride with a weymouth and bradoon. This bradoon has a jointed mouth piece,  When pressure is placed on the reins the mouthpiece breaks at the join. This creates an angle which gives the tongue more room than with a double jointed mouth piece.

he eggbut:

The eggbut is a common multi-dicipline style of  cheekpiece. It comes in different vaiarities, like jointed, double jointed and straight. It has a fixed mouth piece wich prevents pinching  the edges of the horse mouth as is seen by a loose ring. It also offers more moderate lateral control. 

The trust bit types,The Sweet Iron:

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 encourages better acceptance of the bit. The rusting process (oxidation) changes the blue colour of the TRUST-bit to a brownish-grey.If a sweet iron bit is not used for a while, an orange-brown rust layer may develop on the mouthpiece. Simply remove this by wiping the bit with a damp cloth.