Primos Hunting Calls. The No-Lose Call Case protects and prolongs the life your mouth calls. It is designed to breathe, allowing your calls to dry out properly. The No-Lose Call Case has a spring hinge that opens quietly and closes automatically--very important when you are in the woods! It fits right in your shirt pocket or around your neck with the lanyard. Your calls will stand upright, not on top of each other, so you can choose the one you want. A lanyard is included. Primos Model No. 618. Primos Hunting Calls.