Practicon 7046415 2 Disposable Phosphor Plate Protectors, Size 2, 200/bg (US & Canada Only). PlateMates Phosphor Plate Protectors (PSP) fold over X-ray plates to add a layer of protection from bite indentations and creases. Extend the life of expensive phosphor plates and cut diagnostic anomalies. Their thin, clear construction allows plate to remain visible and flexible. Compatible with all barrier envelopes.