It is a basic setup, MDF wood around the sides and top and bottom, but a simple metal cross bar on the back.  There is no backing what so ever and the "fabric" is a cambric type dust cover material only on a slightly thicker quality.  Definitely for the price expected a solid backing, and higher quality shelve material, not something you could poke through with sharp corners.  This is probably a good buy on sale but not at full price!