The rubber on the strap that came with my Fitbit reached the point where it separated from the clasp attached to the Fitbit brick and eventually fell off completely. I bought these 3 sets of straps because the price (compared to a single strap from Fitbit) is so low that it's worth the risk even if they don't fit my device. I'm glad I took the risk. They snap in much more securely than the original straps and I haven't had any issues with skin reactions to them. They're a little tricky to replace, but that's what makes them so safe. All in all a very good product, especially for the price! I recommend anyone with a Fitbit get them as a backup - my other Fitbits had similar issues with the rubber coming off the strap where it attaches to the pebble.
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