Primos Hunting Bottleneck Deer Grunt Game Calls. The Bottleneck Deer Grunt is the perfect call for those that want to produce ideal mid-tone grunts and ROARs. The call's compact size and soft all rubber design make it easily accessible when calling in the big bucks. Specifications for Primos Hunting Bottleneck Deer Grunt Game Call: Manufacturer: Primos Hunting Fabric/Material: Rubber Species: Deer Features of Primos Hunting Bottleneck Deer Grunt Game Call Compact single reed deer grunt Mid-tone deep grunts and ROARs Soft all-rubber design design Lanyard Package Contents: Primos Hunting Bottleneck Deer Grunt Game Call Primos Hunting 770: Bottleneck Deer Grunt Game Calls