Our beautiful 26-inch sitting ball chair is made for the office, home, yard, classroom, or gym, a solution for desk sitting and standing desks, recommended by chiropractors. The sitting ball cover is made of fabric durable and wrinkle-resistant, colorfast, and shrink-proof. The cover is flexible, breathable, and machine washable. The inner ball is our highest-quality anti-burst exercise ball. The sitting ball chair is perfect for back stretching, posture workouts, yoga, therapy, balance training routines, and flexible joints for a healthy lifestyle. Activates back and core support muscles which promote good posture and can potentially relieve back pain. The product included: an anti-burst PVC inner yoga ball, a ball cover, a hand pump for inflation, a plug remover, and two plugs. Some effort is needed for set-up, using included accessories to inflate the inner sitting ball until the outer cover is filled.