Chair with powder coated aluminum 5 way swivel base on castors (available for hard and soft floors, color matching with base), fitted with gas-lift mechanism for height adjustment. Seat with built-in self-tensioning weight response mechanism, backrest with 3-position recline, adjustable lumbar support breathing up to 60 mm. Medium backrest with front in polyester mesh in the same color as the backshell (black or white). Seat upholstered in leather, customer's leather, coated fabric, fabric or customer's fabric. Fixed or adjustable armrests in nylon fiber, color matching backshell, are available upon request and with a surcharge.