The Boss Dolly is not a standalone item and is made for use with Chair Model B1400 (Boss Black Stack Chair with Chrome Frame. Chairs sold separately.) Chairs can be stacked 16 high. This dolly offers the ultimate solution in chair mobility and organization. Whether you need to set up a new conference room or stack and store your chairs; by utilizing this chair dolly, your task just became that much easier. It is made from a black, strong metal material and has hooded double wheel for a smooth roll from point A to point B.