... can be repeated to pull thousands times.trolleyUse AL alloy trolley, which produce standard, can bear about 100kg s pressure ... -designed, more durable.wheelsUse high quality PVC wheels, stainless steel axletree make it more bearing, rolling smoothly, be ware ... in Baigou, China, specialized in various luggages and trolley bags, with advanced technology and talents. All procedure are according ISO ...