I have a 6 inch wrist and the small ones fit well. I started with the 2nd notch and moved to the 3rd after a week and then to the 4th after another week as the straps stretched and sat down. The colors corresponded to the description, it is easy to assemble with the help of a Fitbit, it fits perfectly. There is a notch on the strap to hold the extra strap to insert into the hole that locks it. Good value for money
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