These "composite saw blades" consist of a steel body and additionally soldered carbide teeth of different number and inclination.
In the range of diameter 130mm x 20mm bore you can choose from a fast, coarse cut up to a fine cut blade. According to their information, most of the Saw blades for processing wood, but partly also suitable for sawing aluminium and plastics.
Z=12 WZ, for example, means that the circular saw blade is equipped with 12 tungsten carbide tipped teeth in alternating tooth form. This tooth position is suitable for universal use in hardwood up to Softwood, MDF (medium density fibreboard) or chipboard.