Compact, loud, and made from one piece, this has been the ideal whistle for myself and friends. I've carried it when kayaking, as it works in the wet, and I have a spare on my keys so I'm covered in any situation!
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These are ideal for anyone looking for a loud and grippy rugged whistle. The twin chambers make it very loud, and the external grips are large and designed to grip even with wet or muddy hands, and work very well for when your hands are cold and numb. The extenal details give the whistle strength where strength is needed, while keeping the weight down, so shave every gram off for those lightweight hikers. With no moving parts this is a very reliable whistle, if it gets dirt inside there is no ball to block up like traditional whistles.
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Don't get caught out, with something this small you can't afford to not carry one as you never know when you may need it! There's a hole sized for 5050 paracord, keyloops or even a shoelace. (the hole is 6mm diameter)
This is an affordable and effective accessory, available in many materials and colours.