Frame: aluminum oxidation, foldable, easy storage Rear wheel: solid rubber rear wheel. Front wheel: PVC+PP integrated solid wheel, configured as high-strength engineering plastic wheel hub, air-free solid tire Seat cushion: The backrest material is oxford cloth built-in sponge; the seat cushion material is oxford cloth built-in sponge, with a canvas interlayer greater than 300d in the middle. Armrest: Adjustable, upwards.