Product features; gas-assisted injection molding, split seats, spring dump, hanging installation Main material; polypropylene (PP), high-strength aluminum alloy, hot-rolled plate, hot-rolled profiles Size parameters; width X deepth X height 450X420X800 Using venue; all kinds of indoor field, museum Installation requirements; step height 280mm - 650mm, step width ≥ 800mm, center distance 470mm-510mm Additional features; handrails, cushions, cup holder, antistatic