Generally consists of fabric, sponge pad, liner and outer plate.
Fabric: Generally with hemp velvet, velveteen or car fabrics, and some use leather, imitation leather fabric.
Sponge pad: Made of PU (polyurethane) foam, density 35~50kg/m³ is more suitable.
Liner: According to the design, the use of curved wood splint and metal frame structure, with metal frame structure called steel frame, sometimes the steel frame is buried directly in the sponge. Outer panel: The same as the outer plate function, can also be made of wood, plastic or other materials, the main role is to decorate and connect with the handrail.