This hand cut stag horn whistle has two pitches and a stop hole that enables you to choose which pitch to use. Simply place your finger over the stop hole to change the pitch. Experienced trainers use this whistle as a stop and turn command. All stag horn whistles are hand made from natural horn. This inevitably means that they all vary in size, shape and sound. It is not possible to offer the consistency of the moulded working dog whistles.