Featuring a five-legged castor base, the AAC 153 combines optimal functionality with modern aesthetics.‎ Retaining the same high backrest and generous seat that characterises the series, the base is designed with a gas lift that can adjust the seat height by a range of 14 cm.‎ The base is available in either polished or powder-coated aluminium, and the shell comes in a variety of upholstery options, providing a multitude of design combinations that give this series versatility in a wide range of corporate, public, and private contexts.‎ 10 mm injection moulded polypropylene with 10% glass fibre.‎ Full upholstered.‎ 20-50 mm moulded polyurethane foam.‎5 star swivel base in cast aluminium with soft wheels and gas lift.‎ Available in a large selection of standard fabrics and leathers.‎ Available in 2 different base finishes:- Black powder coated aluminium (RAL 9005) - Polished aluminium