This swing seat is a rotational molded swing made of polyethylene and has a new improved hanger. The dimensions of the seat are 19.75in x 9in x 2in thick. Space between hangers is 16 3/8in. These seats are made wider and studier to hold both small and large children. This seat meets ASTM Standards both commercially and residentially. The seat should last 2 years in harsh conditions and up to 5 years in optimal conditions. Some conditions may require replacement sooner. Tensile strength is 3000 lbs.