Mimic two mature bucks fighting with the Primos Rack-n-Roll. The Rack-n-Roll was designed and tested in an independent sound lab where a real recording of two 140" class bucks was broken down and analyzed by tone and frequency. To top it off, the Rack-n-Roll is the only rattling device that allows you to rattle with one hand so you have a free hand to keep your bow or rifle ready.