These lights are little gems. They are surprisingly bright for there size and fit to any tube on my bike. They can even clip to rucksacks etc... (I am considering buying a second set to do just that). The thing that I like about them is that there is no messing with fittings, they can stretch around chunky handlebars easily and clip off just as quickly. They appear well made and I reckon they will take a few knocks as they are incased in a rubbery/silicon covering.