RL YOYO Chair Features : Height adjustable swivel chair Backrest & Seat Made With Molded Foam Dark Grey Fabric Finish Wire-Control Height Adjustable Mechanism Black Nylon 5 Star Base With Top Grip treads Castors Curved, ratchet backrest Greenguard Gold & BIFMA Certified Overall size: 600mm W x 600mm D x 730-820mm H Weight rating of 110kgs