The Chirp Relief Wheel+ Deep Stretch & Massage Roller is a great choice for anyone dealing with a stiff back or poor flexibility. It helps loosen tight muscles with firm-pressure myofascial release, delivering a deep, satisfying stretch. Spinal Canal technology helps reduce pressure on your spine, so you can roll more comfortably. Plus, the four-way stretch design and EVA foam cushioning help ease tension, improve mobility and support better posture.Large 10" wheel - spreads pressure more evenly across your backDurable ABS core constructionSupports up to 227 kg