This vibrating massage wheel is great for improving your health. Not only does the Chirp Wheel Pro relieve back pain and tension, but it also improves the range of motion. This vibrating massage wheel can help you warm up more quickly and recover faster after workouts. Chirp Wheel Pro’s diameter is 8 inches and its width is 5 inches, making it the perfect fit between your shoulder blades. You can even target knots along your spine with it, as its design allows for easy access. You can also enjoy long, relaxing sessions any time of the day with its 2-hour battery life.