4X20 Inch Folding Bike Rear Racks Aluminum Alloy Rear Shelf for Folding Bicn. 4XMade of Aluminum alloy, and stuy. Easy to use and easy to install. Rack moun to back of your bicycle to h you easily transport your gear.Durable aluminum alloy rack can carry up to 80KG. 1 x Bicycle Rear Shelf.