Hackamore from Lippo.

Soft and flexible hackamore in leather with adjustable front and jaw strap that allows you to adjust the size according to the horse's girth. This model is called pony hack for its shorter shanks, which allows you as a rider to have 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: 16.5cm
Full: 19cm