(Features) This balance chair has an ergonomic design that allows you to naturally stretch your back muscles without force. ● By tilting the chair seat forward, the body maintains balance, the spine naturally stretches and corrects posture without force. It does not put strain on your lower back and gives you a beautiful posture. Comes with a movable backrest, so you can rest your body and relax when you get tired. The gas pressure lift type can be adjusted to your preferred height according to your body shape with the lever operation, so it can be used by both men and women. It can support your body weight even on your knees, so you can sit steadily. The frame is made of sturdy steel, so you can sit with confidence. The seat is about 3.9 inches (10 cm) thick, and the urethane foam cushion gently supports the body. Comes with casters for easy transportation when cleaning. (Specifications) Color: Black; Product Size (W x D x H): Approx. 18.3 x 24.6 - 32.3 x 34.6 inches (465 x 625 - 820 x 865 - 1030 mm); Seat Height: Approx. 21.3 - 26.6 inches (540 - 675 mm); Product Weight: Weight: Approx. 2 kg); Upholstery: Upholstery: Gas-6.75 lbs (9.75 kg); Structural Components: Gas pressure lift device, Comes with wheels. Steel frame with backrest ■ Package quantity: 1 piece; Package size: Approx. W 28.3 x D 18.9 x H 9.8 inches (720 x 480 x 250 mm); Package weight: Approx. 22.8 lbs (10.8 kg); Shipping form: Knockdown assembly required (customer assembled); Country of Origin: China; Instruction manual (English language not guaranteed)