The WH ULTRA developed by Lisa Wilcox and Ernst Hoyos together with Sprenger is a double-jointed bit that features a unique roller in the center section. Lisa Wilcox states: "This unique roller provides a gentle stimulation to the tongue, which encourages the horse to chew, prompting salivation, allowing the acceptance of the bit therefore the relaxation of the jaw. It has been Ernst and my experience that through this gentle stimulation our horses learn more quickly to accept the bit softening their entire top-line enabling us to perform the movements with more relaxation, throughness and ultimately more harmony."