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 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