The thinnest aluminum, the veins are like cotton wool, none, you are afraid to break. Themselves 30 meters of cable are light, I thought there was a coil of optics in the package. It is necessary to unwind carefully, it breaks, it can be easily torn, the outer insulation is somehow too soft. In short, save on everything. It is better not to crimp the connectors that are included, they are of terrible quality. In general, if you carefully lay it and crimp it with good connectors, then it will go for such a price.