Aurigan Metal:

Genuine patented AURIGAN bits are only manufactured by Herm. SPRENGER. 

It is oxidized AURIGAN bits that produce the distinctive and pleasant taste horses love. This particular taste encourages horses to chew and produce saliva which leads to the rapid acceptance.  The extraordinary advantages and excellent acceptance of AURIGAN in the horse's mouth has been confirmed by scientific research as well as a long-term study at the University of Hanover.

AURIGAN is a special nickel-free alloy, comprised of 85% copper, and 11% zinc which, due to the inclusion of 4% silicon, combines the oxidation advantages of pure copper with maximum strength. This is guaranteed by the unique formula and composition of AURIGAN which exceeds the quality of the approved German Silver. A high copper content in a bit material does not necessarily result in optimum oxidization. Aluminum and nickel ingredients actually inhibit the oxidization process of the metal in the horse's mouth – slowing down the reaction!

Get the Right Fit:


To make sure your bit is on properly, Herm Sprenger has added an aid to all their KK ULtra bits. Etched in the side you will find an arrow, that arrow should be on the horses left and facing forward for proper positioning.

KK Ultra Technology:

What is so revolutionary about the new KK-ULTRA Bits?

Regular Bit Showing serious palate contact when engaged.

KK Ultra Bit because of design remains clear of the palate eliminating interference.

In collaboration with SPRENGER, the Veterinary University in Hanover undertook a new project which included measuring the height of the equine palate and the size of cavity where the bit sits.

More than 70 horses' heads were analyzed after which it was discovered that

• the interior volume of the mouth was less than had been previously thought

• the palate was both smaller and very often flatter than originally imagined

• the space left for a bit is therefore rather limited

Based on these findings the KK bits were created and then improved upon.

1.   As the palate is narrower than originally assumed the lozenge in the center was shortened (this results in no pressure being put on the palate).

2. The angle of the link was twisted by 45°. This ensures that, when a contact is taken up via the reins, the rounded link rests fully on the tongue without squeezing it.

3.  In short, the sense of touch in the tongue is utilized and not abused, enabling clear instructions to be given through the reins.