feature:office chair 1)large nylon base with twin wheel hooded casters 2)stylish back for additional comfort 3)seat slider(depth adjuster)as standard 4)automatically adjusts the shape of the body 5)computer chair packing:1pc/a cartoninner packing:plastic bagsouter packing:cartons quality standard:ISO9001 standard for quality control US&UK fire proofing standard for foam and fabric BIFMA standard for arm,base&wheel