For use Imaging Plate (Digital Sensor), it is used to protect the IP and avoid cross inflection among the doctors and patients .300Barrier Envelopes SIZE #2 for Intra Oral X-Ray ScanXPhosphorStorage PlatesFeatures:1.Reduce Cross-Infection.2.Keep the Phosphor Storage Plate Clean.3.Easy to use.4.Low cost, Disposable Use.5.Compatible with Scan-X Air Techniques and many other brands!