They're great! I bought a pair of red ones and a pair of blue ones for the kids' Razor scooters. If you're buying multiple, be careful which retailer you're referring to - I paid about fifteen dollars for two pairs with combined shipping. The wheels themselves work exactly as advertised. In fact, this is a direct replacement for regular wheels. Although the lights aren't very bright during the day, that's to be expected. As it gets darker they become quite light and very attractive. I was very pleased with the improved visibility, especially as the days are getting shorter and daylight saving time is over. We often go out as a family in the evenings and I feel comfortable letting the kids run around because they're easy to see. At this point I'm guessing we've put at least 15 miles on these bikes and they seem to be wearing out well. Aside from the safety aspect, these wheels look damn cool.
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