Stool designed to work with Sit/Stand desk systemsGas Cylinder height adjustmentUnique polyurethane seat design makes it ideal for static sensitive and heavy duty areasComes standard with Casters (for normal desk applications) so chair will roll with user as desired and Glides (for Sit/Stand static applications) so chair will not roll away from userMechanism has tilting feature and can be locked at desired angle or left loose for chair seat to move with the user continuously.WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.