Rocky Mountain Hunting Calls Signature Series Elk Diaphragm Rockie Game Calls 3 Pack. Specifications for Rocky Mountain Hunting Calls Signature Series Elk Diaphragm Rockie Game Calls: Manufacturer: Rocky Mountain Hunting Calls Color: Blue Fabric/Material: Latex Species: Elk Call Type: Diaphragm Package Contents: Rocky Mountain Hunting Calls Signature Series Elk Diaphragm Rockie Game Calls Rocky Mountain Hunting Calls 154: Signature Series Elk Diaphragm Rockie Game Calls 3 Pack