The original Fitbit Charge 4 strap broke and was terrible quality, bent etc. This is a great replacement for it - works similar to An Apple fits the watch band very well. I didn't know whether to buy small or large, chose large and it seems to work well - wrist size is just over 7 inches. The strap is of very good quality and appears to be well made. , more expensive than the cheap multi-piece sets on the website! Hope it lasts long!
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