Chadko Plastic Shelf Inlays - 18 x 36 Grey

These heavy-duty plastic shelves are goodlooking, sturdy, and easy to clean. They have prenotched corners to fit any standard wire shelving unit. The only drawback is their price. They come in a variety of colors, not only grey, from a few shelving vendors. Whatever you do, though, don't buy the enclosure kit by the same manufacturer sold as a way to make a cabinet of your shelving unit (see review of that).