Infinitely adjustable seat height with top lift. This model bears the GS mark from LGA Nuremberg and meets all safety-related requirements for office and contract use according to DIN EN 1335 Part 1-3. Ergonomically shaped backrest with an integrated, elaborately padded comfort headrest. Comfortable, extra heavily padded seat with a bowl shape. Upholstered in genuine black leather with intricately stitched white double seams, the back and side parts are made of matching synthetic leather. Kinematic rocking mechanism, with spring force individually adjustable to body weight. Aesthetically pleasing and stable polished aluminum base. Equipped with load-dependent braked safety double casters for carpeted floors. This allows the chair to roll only under load; in an unloaded state, the casters brake to prevent unwanted rolling. Includes armrest "F2". This item is delivered disassembled. Assembly can be completed in a few simple steps. No assembly is required for gas springs, chair casters, footrests, etc.