Mullen mouth bits: Precise action and optimum control in equestrian sport
Mullen mouth bits are very popular in both leisure and competition sport. They offer precise action and even pressure distribution in the horse's mouth, which can be particularly beneficial for sensitive horses. Nevertheless, these bits belong in the hands of experienced riders with a sensitive hand. In this article, we take a closer look at the different designs, how they work and the specific advantages of mullen mouths - from classic models made of stainless steel or SENSOGAN to alternatives made of thermoplastic such as the NATHE mullen mouth bit.
A mullen mouth is characterized by an unjointed, continuous mouthpiece. Unlike single or double jointed bits, the pressure is distributed over the entire width of the tongue and the horse's lower jaw when the reins are taken. This pressure distribution makes mullen mouth bits particularly suitable for horses that are sensitive to punctual pressure. At the same time, the rigid shape of the bit enables a precise transmission of rein aids, which can be helpful for advanced riders. In contrast to jointed bits, a mullen mouth exerts constant pressure on the tongue, even when the reins are held loose. It is also virtually impossible to give single-sided aids, as otherwise the bit will jam. This makes it more difficult to work out the flexion and bend and makes mullen mouth bits rather unsuitable for dressage work.
Variants and designs of mullen mouth bits
Like the other mouthpiece shapes, mullen mouth bits are available in different designs to meet the individual needs of horse and rider. The hardness of the bar can vary: flexible models allow more one-sided action than rigid bars. Well-known variants are:
Straight mullen mouth: Straight mullen mouths distribute the pressure evenly across the entire width of the tongue.
Mullen mouth with port: This version has a slightly curved shape that takes the pressure off the middle of the tongue, making it particularly suitable for horses with a thick tongue or those that are sensitive to pressure in the middle of the tongue.
Lock-up bits: These bits work like a normal jointed bit, with a constant soft contact. Only when the horse becomes strong and a clear effect is required does the bit become a rigid bar and the aid reaches the horse's mouth more precisely. If the horse yields, the locking effect also diminishes. These include, for example, our MAX-Control bits.
Flexible mullen mouths: In contrast to rigid bars, these bit models allow a slight one-sided aid to be given. When the reins are pulled, the pressure is still distributed over the entire width of the tongue, but it has a greater effect on the edges of the tongue. These bits (such as the SPRENGER FlexControl or the DUO bits) are suitable for horses that occasionally get stuck or four-legged friends that are less comfortable with jointed mouthpieces.
Effect of mullen mouth bits
The effect of a mullen mouth depends on the shape and design. In general, the rigid structure ensures that the pressure is evenly distributed when the reins are pulled. As a result, these bits are often very popular with show jumpers. A mullen mouth with port relieves the middle of the tongue and is particularly suitable for horses that cannot tolerate any additional pressure there.
However, the rigid shape also has disadvantages: One-sided influence is difficult to achieve, which is why horses ridden with a mullen mouth should be able to react independent of the reins and well on weight and leg aids.
SPRENGER mullen mouth bits: Quality and variety
SPRENGER is known for the high quality and precise workmanship of their bits. SPRENGER mullen mouth bits are made from high-quality materials that ensure durability and comfort. The different designs, such as the eggbut bit or classic models, allow the bit to be perfectly adapted to the horse's needs. SPRENGER mullen mouth bits with port are an ideal choice for horses that have a thick tongue.
An interesting alternative is the SPRENGER MAX-Control bit, which works like a normal double jointed bit when the horse seeks a light contact, but has a mullen mouth effect when the reins are held more firmly, as the joints lock in place. As soon as the rider or horse yields again, the lock-up effect of the bit also diminishes and it works like a double jointed bit again.
NATHE mullen mouth: Suitable for sensitive horses
In addition to metal bits made of stainless steel or SENSOGAN, NATHE offers an excellent alternative for sensitive horses. NATHE bits are made of thermoplastic, a particularly smooth, mouth-friendly material that ensures a gentle but precise action. NATHE bits therefore do not lead to an eraser effect, which can occur with rubber bits, for example, due to the duller surface. NATHE bits are also poor heat conductors and therefore quickly become comfortable for the horse even in cold temperatures. Here, too, there are different variants (soft or hard bars, with or without port) and side pieces that can be selected according to requirements. NATHE bits are ideal for sensitive horses that do not accept metal bits so well.
Making the right choice: Tips for fitting
The right size and design of the mullen mouth is crucial for the horse's comfort. A bit that is too large can tilt when the reins are applied on one side, which can be uncomfortable for the horse. It is therefore important to choose the size carefully and make sure that the bit with fixed side pieces fits close to the corners of the mouth without causing pressure points. For bits with fixed side pieces such as the eggbut or D-ring, care should be taken to ensure that they are positioned correctly to take full advantage of the lateral limitation. For mullen mouths with loose rings, as with all looser ring snaffles, there should be 3-5 mm of space between the bit ring and the corner of the mouth to avoid pinching. You can read more about the correct fit of the bit in the article 'Does my bit fit?'
Conclusion: Mullen mouth bits - versatile and precise in action
Due to their rigid shape, mullen mouth bits offer precise aids and even pressure distribution in the horse's mouth. They are an excellent choice for horses that are sensitive to restless bits or react sensitively to punctual pressure. From classic metal models to mouth-friendly NATHE bits, there is a wide range of variants that can be tailored to the needs of each horse. It is important to adapt the bit correctly and take the horse's individual requirements into account in order to get the best benefit from this type of bit.
