Yes,also beware of power strips and electrical wires in general: those coming from there are increasingly made of coated iron instead of copper or brass in contacts. The side effect is a much higher resistance that makes the wire dissipate a lot more power than it should, even to the point it can overheat and catch fire if under serious load (heaters, ovens etc.). Their exceptionally bad insulation and usually smaller size than advertised make the problem even worse. Such bad cables can be used for breadboarding where small lengths and low currents mitigate the effects, but they shouldn't be considered for anything serious. I've learned to ditch almost every bundled cable coming from there after multiple bad experiences. Surplus is a good source of top notch cables that can last decades. Crappy cables can be checked using a magnet: pure copper ones won't stick. There are also reports of junk coated aluminium cables that wouldn't stick as well to a magnet, but they're rare as aluminium, at least good quality one, is not cheap.