large nylon for stability with twin wheel hooded castors heavy duty gas seat height adjustment 154kg 25 stones posture curved seat with pronounced waterfall front reclining seat tilt mechanism with tension control adjustable for body weight hooped nylon armrests for user comfortmeasurementswidth 510mmdepth 490mm back width 570mmback height 630mmseat height 570mm48 hour delivery seatingthese office chairs will be