Comfortable intervertebral disc swivel chair. Continuously variable seat height adjustment with Toplift (LGA tested). High, contoured backrest with spine shaping, height adjustable via ratchet mechanism. Special intervertebral disc seat for optimum support in the pelvic area. Synchronous mechanism with body weight adjustment, continuously lockable. Chrome-plated steel base equipped with load-dependently braked double safety castors for carpeted floors. This model bears the GS mark of the LGA Nuremberg and fulfils all safety-relevant requirements in this context.