Simple and dependable. You're going to love the way this call works. The Sonic Dome Series has been designed so the call is automatically positioned correctly in your mouth. The dome gives you a consistent distance between the reeds and the roof of the dome, for an incredibly consistent sound. The Sonic Dome Series calls use latex reeds. These calls will do it all. Features: - Three Latex Reeds - Reproduces the growl, bugle, and chuckle of the herd bull- Single produces cow, calf and satellite bull sounds- Double produces estrus cows and herd bulls sounds- Triple produces growl bugle and chuckle of herd bulls- Mini Sonic Dome 3 Pack includes Single, Double, Triple and See-Thru Call Case