Equipped with 6 heavy-duty 3.94" engineering plastic wheels with track-type climbing mechanism. Effortlessly conquer stairs/grass/brick surfaces (note: not for hollow wooden stairs). Glide silently on flat ground while maintaining steady control during stair - moving heavy loads feels as natural as pushing a suitcase.Patented folding mechanism requires no tools for quick storage. Collapses to just 6" thin, stands upright behind doors/under beds/in car trunks. Automatic locking system prevents accidental unfolding, saving 70% more space than traditional carts.