The roll cages can be folded or unfolded,the surface dispose is zinc plated or colour plated or powder coated or hot galvanized.Now we have two sides ,three sides,four sides and four sides add cover,the castors of the roll cages are 5" nylon castors and 6" PU castors,The products are sold to USA,the United Kingdom,Canada,Sweden,Sinapore and so on. We have been in this line for thirteen years,We can supply this item according to your design.