Built from Poly-Carbonate, the base material in bullet proof glass, the Reese Surge Six Pack is designed to withstand the toughest elements you throw at it. This combo produces all the sounds needed while in the field working coyotes and other predators. From coyote vocalizations(male, female, and pup) to rabbit and rodent distress. This set also includes our Jack on Crack! Set Includes: Jack on