Material: Eco-friendly PVC material Relieve back pain and improve your posture: placing the rocking board on your office chair will prevent you from sitting in the same position all the time, relieving back pain, improving your posture and giving you more energy. Enhance balance and core strength: The desk gym is suitable for offices, homes and schools; you can place these mats on your office chair as relaxing cushions or use them as props designed as games for children to engage and exercise; the wobble seat strengthens children's core muscles and improves their balance, coordination and by standing up and balancing flexibility Easy to carry: Made from high quality PVC material, each sensory seat cushion measures approximately 13.8 inches/34.5 cm and is light enough to carry around, making it easy to exercise core muscles while sitting in the classroom or doing work at your desk, everywhere. Wide range of application: The desk fitness equipment is suitable for use in offices, homes and schools; you can place these cushions on your office chair as a relaxing cushion or use them as props to design games for children to engage in and exercise