Infinitely adjustable seat height with top lift. This model bears the GS mark from LGA Nuremberg and meets all safety requirements for residential use. Round, ergonomically shaped seat. Stable base, mounted on a patented rubber tire, with lateral deflection, adjustable based on air pressure, metal base plate in chrome. This item is delivered unassembled. Assembly can be completed in just a few simple steps. No assembly is required for gas springs, chair wheels, footrests, etc.