It is made up of a 17 1/ 2" exercise ball covered in choice of vinyl or mesh fabric for a polished and professional look. The base swivels 360 degrees with active, user-controlled movement for a more active and healthy workday. These ball chairs make for a great alternative desk chair or for use in meeting areas, gathering spaces, collaboration areas, the home or anywhere else a chair is needed. The unique design may help to support better posture and balance. Its rubber molded base ensures that the chair keeps a steady grip and does not slip during use for a safe and steady alternative to a regular exercise ball. Pump is included. Designed by Thomas Walser.Features :- Finish: Black- Material: Steel- new spin on Zenergy- Ball Chair- anti-burst 17 1/ 2" exercise ball covered in vinyl or mesh- 360 swivel base with active, user-controlled movement- use as alternative desk chair, in meeting areas or gathering spaces- may help support better posture and balance- Provides ample movement as it allows users to swivel and lean- Rubber molded into base so chair does not slip- pump included- Designed by Thomas Walser.Specifications :- Target Audience : All Ages- Assembly details : Adult Assembly- Warranty Description : 1 Year Limited Warranty- Maximum Seating Capacity : 1- Seat height maximum floor to seat top :- Seat height minimum floor to seat top : 23- Seat back height : 0- Adjustability : non-adjustable- Adjustability : fixed- Furniture Subtype : Ergonomic office chairs- Product Weight : 14 lbs- Product Dimensions : 17.5" H x 17.5" W x 22.5" D- Recommended Location : Indoor- Recommended Room : Office.