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There aren't a lot of sellers offering these pesky little band holders and I can understand why. By the time you source the product, send it in to Amazon and give Mr. Bezos his cut there's not a lot of meat left on the bone from this sale.
Slipped right on my Approach X40 and stays put really well. If you're a person in need of one of these you know how much of an annoyance it is to be without (or to try using one from a different device...which is almost as frustrating as not having one).
These are an ok replacement for the original. The edges are sharp and catch on your skin. The grade if material is also much different than the original and does not feel smooth. It does not slide freely on the wrist band.
The loop on my vivosmart hr+ broke and I couldn't decide whether to replace the whole band or just replace the loops. Might be a slightly lighter weight than the original, but I figure I've now got a decade's worth of replacements now. Very happy with my purchase.