ALSTER combines innovative design, comfort and an impeccable finish. CONSTRUCTION Tubular steel and soldered metal mesh. Choice of 3 types of base: - 1 base made from matt black steel tubing and strips which rotates 360° with automatic return (to initial position) function. - 1 rotating, height-adjustable 5-branch polished aluminium base on castors. - 1 rotating, height-adjustable 5-branch aluminium base in grained black finish. COMFORT Bultex foam 38kg/m³ - 3.6 kPa, over a metal frame. MAKING-UP Twin-needle overstitching on seat and back, with overstitching on the sides. FABRICS Thick fabrics (e.g. wools).