This office chair back support set comes with two mesh cushions to provide lumbar support for your lower back. Made with durable ABS plastic, these cushions are designed to last. The ergonomic design helps to improve posture and reduce back pain, making them perfect for use in the office or at home. With a buy one get one free offer, you can enjoy the benefits of these cushions at an affordable price. Easy to install and adjust, these cushions are a must-have for anyone who spends long hours sitting.