The gag produces a head raising action and is often used for cross country and/or jumping where the head needs to be raised quickly in order to gain control and so to get ready for the next jump.
The roller mouthpiece bits have proven one of the of the most popular of mouths. It has a oval shaped link in the center, made from the happy mouth material which is movable an rolls around the stainless steel centre.
It has 2 joints, which means the pressure of the bit is distributed over both the tongue and bars of the mouth. Because the mouthpiece has two joints, it shouldn’t cause any interference with the roof of the mouth. The roller uses tongue pressure to encourage the horse to go on the bit and lower the head, it has bar and lip pressure but not a ’squeezing’ action like that of a bit with a single joint. The more joints a bit has the less likely the horse is to lean as the bit becomes more mobile. The roller also encourages mouthing and acceptance as the horse can play with the roller and be kept content