Folding main structure built with chrome-plated cold-rolled steel; tubular with a diameter of 20mm and a minimum thickness of 2mm with reinforcements and crossheads. armrests made of light and resistant material. stainless steel side protectors such as a cold-rolled steel plate or plate with a minimum thickness of 0.8 mm. backrest in fixed position seat and backrest covered with washable korofan tapestry; black color; raincoat; easy to clean and disinfect; scratch or puncture resistant; antibacterial; anti fungal for hospital use. with internal temperers that prevent deformations. ability to support at least 150 kg of weight.