Trust Sweet Iron eliptical dr. Bristol D-ring 16mm

The Sweet Iron dr. Bristol D-ring by Trust is a eliptical bit of which the middle part is thinner. When the horse is relaxed during riding the middle piece is flat on the tongue give a light pressure. Then the horse comes against the bit the middle part flips which creates more and sharper pressure.  

The D-ring:

The D-ring bit  gives the rider more leverage with making turns. The D shaped rings give more pressure on the horses cheeks and  make sure that the rider can't pull the bit through the horses mouth. This makes the D-ring bit useful for schooling young horses. It is a bit which lies stable and calm in the mouth of the horse. The D-ring  bit is a bit sharper than a snaffle or eggbut.

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.