We mainly use a high-density polyethylene(HDPE) 5502 material which is imported form korean, and blow molding production process for this bus seat. Our product is a reasonable structure, and a good style, appearance, shape and smooth surface, high strength, impact resistance, weather resistance, chemical stability, acid, anti-static, wear resistant , anti-uv, & color stability. Capacity:1l~100l Weight:60g~4800g.