1. plastic environmental protection material, odorless, durable, corrosion-resistant, easy to clean and not deformed.2. Help make your muscles more sensitive during exercise, help you stretch correctly and reduce the chance of injury.3. It also helps restore X-shaped legs, O-shaped legs, and relieve plantar fasciitis, Achilles tendon injuries, calf strains and other ankle pains.4. Concave and convex surface can prevent slipping.Portable and easy to assemble, it can be used immediately.5. Suitable , office, travel and indoor and outdoor sports.Name: Muscle Stretcher Foot Board Colour:B: blue Material:plastic Size:about 29 x 27cm Package Contents: 1 x Stretching Board Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.