The swing seat is composed of EVA plastic that is soft and sturdy enough to make you feel comfortable. Moreover, it is not easy to deform or squeeze out. It is of chemical resistance, corrosion resistance and crack resistance. The size of U-shape of the swing seat is “24 * 5.9” inches. You will find more fun and feel safe when sitting on the swing seat. | Agptek | | Swing Seat with 66" Anti-Rust Chains for Outdoors, Playground, Jungle & Gym | Green | Best Buy