The Weymouth bit differs clearly from the other bits commonly used in equestrian sport, which are usually single or double jointed. The Weymouth bit, used with a double bridle, works with one straight bar, to which the so-called shanks are attached. In addition, a chin chain is part of the double bridle, which runs loosely under the chin, but is also involved in the leverage effect of the bridle. As a rider you must have a very steady hand when using a double bridle, in order to avoid hurting your horse.
If you are already riding in the higher levels of dressage and perhaps even at competitions, then the double bridle is a must. You will find a great selection of double bridles at Horze, including some with browbands featuring Swarovski crystal accents.