I've used these before, and (for me) one of these is as an essential bit of kit to have in my saddlebag as a spare innnertube & pump; they take up virtually no room but if you have a tyre trauma can get you home without scratting round in the dirt for something to try and patch up the tyre, or hoping that that 'gel' wrapper will do the trick. (It won't).
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Haven't actually used it yet as it is for emergency use. I actually needed one some time ago and realised I didn't have any and at the time I couldn't find a shop who had even heard of them. Puncture repair outfits used to include one. So I started searching and found the Park item. Excellent.
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Not had cause to use them yet so cannot comment on their effectiveness.
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