Red Rock Outdoor Gear G.I. Whistle Black. O.S. whistle. In the event that you get lost keep Red Rock Outdoor Gear Signal Whistle in your first aid kit. Red Rock Outdoor Gear Survival Gear the source for outdoor and tactical accessories. Specifications for Red Rock Outdoor Gear G.I. Whistle: Manufacturer: Red Rock Outdoor Gear Color: Olive Drab Height: 2 in Size: One Size Weight: 1 oz Depth/Thickness: 0.75 in Features of Red Rock Outdoor Gear G.I. Whistle Olive drab whistle with lanyard Durable plastic construction Package Contents: Red Rock Outdoor Gear G.I. Whistle Red Rock Outdoor Gear 06-007: G.I. Whistle Black