For the 2mm Polyester model of Liderkit Group, sidewalls are made of polyester reinforced with fiberglass (2 mm thick). This polyester plate is internally reinforced with vertical steel omega profiles.
In contrast to aluminum kits, this type of kit presents a single external surface (not divided into sheets). External profiles consist of ”2 pieces”, without any visible sealing or rivets on the external surface.
This is an alternative to the aluminum kit. It has a similar weight and a much easier repairing. There is a second version of this kit, with a polyester plate 3.5 mm thick instead of 2 mm (Mod. 660).