The ladder is made of fibreglass reinforced polyurethan of different degree of density, according to the structure of each part (the steps are made in hard PU to be stiff whereas the beams are made softer to resist impact and material deformation) Components of stainless steel is inserted into the form before casting. In total the ladder is casted in 5 forms, whereas the length of a form can be shortened, to allow the production of ladders with a length in modular steps.