Made from injection-moulded plastics they will give many years of service. They are hard wearing, UV resistant and can handle very high wind and hail without damage. These blades we used on our Smart 400 turbine. Capable of over 700 watts in high winds and 300-400 W in 36 km/h winds. Supplied with machined ali 6mm thick disc and drilling template so that you can make your own hub to suit your needs. Steel hubs in picture not supplied as we have ran out of stock..