The shell is made of glass-fibre reinforced polypropylene, with leather, leather or fabric upholstery. The stem is available in 5 different models: - Eva 1, die-cast aluminium stem - Eva 2, round tubular frame, stackable - Eva 4, triangular-section tubular frame - Eva 5, solid ash wood stem stained oak Eva is also available in a stool version, with the same choice of materials and finishes for the shell and triangular-section tubular frame.