Height-adjustable, active seating solution that provides ergonomic posture to users. Design is a symmetrical balance between the base and top, giving it a sleek look, which sets it apart from traditional seating and other similar seating options. Features an upholstered seat that swivels on an aluminum base. Base is designed with a flexible ring underneath to allow the user to adjust the angle to provide a chair where the user can perch, lean or sit. The base also provides movement for the user, helping them have an active seating experience. Height adjustment allows the chair to be used in a variety of work applications and at various work surfaces. The ring mechanism wraps around the entire seat that allows the user to easily adjust the seat height by a simple touch of a finger from any position. There is also an easily graspable channel built-in to the underside of the seat for easy portability. Designed by Thomas Walser. Recommended Applications: General Office & Task; Seat/Back Color: Black Vinyl; Arms Included: No; Pneumatic Seat Height Adjustment: Yes. Attention California Residents: Prop 65 Warning WARNING: This product can expose you to Lead, which is known to the State of California to cause Cancer. For more information go to www.P65Warnings.ca.gov. UPC: 073555300048 UPC: 073555300048. No returns.