Nathe D-Ring snaffle 20 mm with flexible Mullen Mouth

Item number: 40450


Thickness 20 mm
Ring-Ø 75 mm
  • mouth and tongue friendly
  • lies steady in the horse’s mouth, no slipping through
  • with low port
  • steady and even pressure distribution on the tongue
  • direct impact on lower jaw due to fixed cheeks
  • helps horses that tend to fall out whilst riding or approaching an obstacle
  • bit guards protect the lips
  • with steel core
Are you seeking more direct communication with your horse? No problem: this D-ring snaffle with the flexible Mullen Mouth provides a constant and evenly distributed gentle pressure on the tongue and the lower part of the mouth. It sits quietly in the horse's mouth because the fixed D-rings to prevent lateral slippage and promote direct transmission of rein support. Horses that tend to fall out over the shoulder will also benefit from this gentle restraint.

At the same time, the bit offers a level of comfort that will satisfy sensitive and mouth-sensitive horses. Made from high quality thermoplastic, our Nathe bits are not only anti-allergenic, but also temperature resistant and dimensionally stable.
More Information
Ring type D-Ring
Thickness 20 mm
Material Thermoplastic
Mouthpiece Mullen mouth
Ring-Ø 75 mm
Disziplin Jumping

Prerequisite for a correctly fitted bit is a correctly and not too tight buckled noseband. The bit should be chosen in the appropriate size and must be fitted close to the corners of the mouth. If you cannot put the headpiece of the bridle over the horse’s ears easily, the bit is buckled too high. If the cheek piece is shaking after taking up the reins, the bit is buckled too low.

All Sprenger bits that are marked with an arrow at the side of the mouthpiece have to be positioned correctly in the horse’s mouth. In order to ensure Optimum effectiveness the arrow has to point forwards on the left hand side.

Conventional loose ring

Bits not being marked with an arrow may be positioned in any direction. This normally applies to standard single jointed or straight mullen mouth bits. Standard single jointed bits have a production related characteristic: one part of the mouthpiece is longer than the other which results in stronger influence on one tongue half. To prevent exerting uneven pressure in the long term you should turn the bit around periodically.


Turnado bit

If you want to avoid the problem of exerting uneven pressure due to a single jointed bit you can use our Turnado or single jointed Dynamic RS bits. The joint of these bits has been turned forward by 45 degrees in order to guarantee an even distribution of pressure on both sides of the tongue.

The bit operates like a communication channel between rider and horse. As the mouth is one of the most sensitive parts of the horse’s body it is important to treat it very carefully. Therefore a bit should be sized and fitted to the individual anatomic shape of the mouth as well as to the characteristic needs of the horse and should never be uncomfortable or awkward in any way.

There are two factors to consider when choosing the size of a bit:
- Width
- Thickness


Bits with loose rings

With correct attaching of bit with loose rings, there should not be more than 0.5 cm space on the right and left between mouth corner and bit ring. The ring should always be freely movable and should not pinch the mouth corner.


Bits with fixed cheeks

e. g. eggbutt, Full cheek or D-Ring bits

Bits with fixed cheekpieces such as eggbut or D-ring bits should fit closely to both mouth corners and must therefore be Chosen smaller than loose ring snaffles. Due to the contact of the cheek to the corner of the mouth the rider achieves additional support from the rein aids.



Double bridle

The double bridle consists of a weymouth and a bradoon. The bradoon should equal the standard snaffle in size and shape because it lies at the same position in the horse’s mouth. The weymouth is positioned a Little bit lower where the horses head gets thinner. We recommend to choose the weymouth 0,5 to 1 cm smaller than the bradoon in order to achieve the best possible effect and to make it most comfortable for the horse.




The thickness of a bit should be adapted to the anatomic needs of your horse. A study of Sprenger and the Veterinary University of Hanover found that the oral cavity of horses is fairly small and the available space for a bit can be very limited. You cannot draw conclusions from the body size of your horse to its oral cavity.



To find out what thickness you should choose for your horse you can try the “2-finger-test”. You just need to put your index and middle finger together and insert them in the horse’s mouth at the point where the bit usually lies. A small gap between the upper and lower jawbone will exert pressure on both fingers and will require a thinner mouthpiece (14 – 16 mm) in order to fit comfortably. If you feel only little or no pressure on your fingers there is space for a thicker mouthpiece (16 - 18 mm).


Using a too thick bit will exert pressure on the sensitive palate and will cause bruises and injuries. The horse might react with head tossing, gaping its mouth or jerking on the reins.