The frame is made of a hot-dip galvanised steel tube measuring 60 mm in diameter. The ball joints and panel fastenings of the frame are made of glass-fibre reinforced polyamide plastic for outdoor use. They are highly durable against temperature and weather changes and physical impacts. The nets are wrought from durable, coated steel cables. Cruciform stainless steel joints keep the crossings firmly in place, protecting the fabric against wear. The rope fasteners are made of strong plastic.