Unique design features and choices to fit every user's needs. capacity interior ball, with a zip-off removable laminated fabric cover, a sewn-on handle, and the customer's choice of seven stock ball cover colors. Only it stabilizes the seating ball securely with industrial hook and loop fasteners in a correctly. Capacity steel base with powder-coated or chrome finish and 6 or 8 heavy-duty molded rubber feet. It user will enjoy a safe supportive fabric seating surface with the ability to move easily and even bounce while maintaining good posture and encouraging core body strength. Finally, it offers the convenience of an optional easy to use and remove mobility dolly with 4 or 5 lockable swivel casters.