Frame: made of cold-rolled steel plate, treated by electro-coating & powder-coating. Detachable quality ABS headboard, Blue color, and brown color option. 2 pcs Collapsible aluminum alloy side rails with safe lock, each with 6 bars. 2 pcs cranks, control of all operated functions and movements. 4 pcs 5 inches luxury noiseless wheels,with brakes, φ125mm.