The MK Unique Designs bite and blow Hyper Estrous call, uses an open reed to produce the Hyper, aggressive vocalizations of a cow elk in heat while offering unlimited control. Perfect for use during the rut, these estrous sounds really bring the big bulls. Just change the movement of your lips to change the sound of the call all of our elk call come with a bag with elk on it and its own box as seen in the pictures these are made on at a time. they are truly hand made and tuned. Send us pictures of that big bull.