RFID inlays can be either "wet" or "dry" ,Wet inlays are inlays that have an adhesive backing with a clear or colored topsurface of PVC,PET or paper, the PVC or PET wet inlays are commonly used to make "RFID Labels" where the inlay is placed on the back of the label with the adhesive side away from the label side so that the label has continuous adhesive.     PLacement of the on the label is very specific to each RFID printer in order to be programmed correctly by the printer and also to minimize the risk of damaging the RFID inlay while in the printer. are inlays that are attached to the substrate backing material commonly called the web.