Hackamore from Lippo.

Soft and flexible hackamore in leather with adjustable noseband and chin strap, allowing you to adapt the size to your horse's build. This model is called a pony hackamore due to its shorter shanks, which gives the rider a very gentle communication with the horse without too much leverage.

Measurements of the shanks (measured from the entire shank, not from the rings):
Pony: 16.5 cm
Full: 19 cm