1.Combined climbing stairs wheels, 2.40L volume and up to 20KG weight loaded, 3.More than 10 million pieces ... shopping trolley bag 1.Combined climbing stairs wheels,2.40L volume and up to 20KG weight loaded,3.More than 10 million ... size Φ16mm Steel pipe thickness 0.6mm Wheel diameter 6x4" Volume of storage bag 40L Fabric 600D polyester Product weight 2 ...