Back... In this case, the stiffner material seems to be made of a whitish nylon like woven fiber. In my experience, smell is a part of the items we collect. I have notice a simular smell in my real cloth items. These tabs have no odor what so ever. Also, notice the lack of excess piping material bundled in the back of the tab like all the originals I know of. (as seen on the backs of all of the original tabs I have displayed in this thread: http://gmic.co.uk/index.php?showtopic=3300 ) Despite all of these factors, I feel that these tabs are fairly convincing. The method of embroidery and actual construction are very good.