Primos Rut Roar Grunt Call -We changed the angles of the call so that it cast the sound down when calling from treestands. The all rubber construction allows you to manipulate the call to be blown full volume (the Roar) to much lighter tending grunts without having to adjust the reed. We increased the chamber size of the challenge wheeze to get increased volume and range out of it. And, we bettered the form fit to your arm so that the Rut Roar is always at the ready but out of the way. The Rut Roar is the best deer grunt on the market, period. Reproduces aggressive, mature buck soundsBuilt in Challenge Wheeze Ergonomic shapeAngled outlet for directional calling