All our aluminium tent poles are made with hard structural aluminuim which is anodised to protect it from harsh and salty enviroments. No blackening of canvas products or hands, means it is ideal for use in camper trailers and caravns or under a tarpaulin. All plastic fittings ar UV treated to last longer in the sun, and nuts and bolts are yellow zinc plated . The poles are ideal for the weight conscius camper.