700mm nylon base with twin wheel hooded castors Medium tulip backrest with three dimensional curvature incorporating lumbar & spine support Adjustable ratchet backrest height Sculptured posture curved seat with waterfall front Heavy duty gas seat height adjustment 25 stones /154 kilos Fitted with seat slide for multi use installations Multi set mechanism for gas seat height adjustment, permanent contact backrest rake & forward seat tilt Directional arms which can be adjusted up & down, side to side & widthways to allow for greater seat area Delivered flat packed for easy self assembly 1 Year manufacturer's guarantee