Review on RuenTech Replacement Fastener Ring for Garmin Vivosmart HR / HR+ Bands - Pack of 11 - Silicone Connector Security Loop - Compatible with Garmin Vivosmart/Vivosport/Vivoactive 4S/Vivomove 3S/Venu 2s - Color: Black by Vanessa Szymanski

I'm still wearing the VivoSmart HR, at least until it dies and I have to replace it. The group is great, but over time it will fail and I have replaced it before. What fails most often is the small retaining ring. I bought a replacement once before it fit, but I didn't have the small internal tooth holding it in place. This one has a small tooth and is virtually identical to the original that came with the strap. I believe they are sold in packs of 10 because they are too cheap to sell in smaller quantities. I'm sure it will fit other Garmin fitness trackers with a similar strap size, so I'll be using additional trackers replacing the VivoSmart in the future.