Since the Fastfender has to hold heavy fenders with the probability of friction between the protections and the boat, it must be very resistant and is therefore made of a very robust plastic material, but at the same time light and small, so as to be comfortable in one hand.Some data: Salt water and UV resistant Temperature resistant from -20 and 40 C Suitable for handlebars ,tubular, steel cables, handrails with up to 40 mm Suitable for ropes between 6 and 14 mm thick.Does not line or damage the fender The Fastfender is resistant to tensile forces up to 150 kg! FASTFENDER 40, for tubes max get 40 mm in packs of 2 pieces FASTFENDER is 40 mm 160 x 76 x 47, for lines from 6 to 14 mm, blue