Pac-Dent’s Armor Barrier Envelopes features a Y-notch design that ensures the envelope tears open in a single direction to reduce contamination. Armor Barrier Envelopes provide an extra layer of defense, allowing Phosphor Storage Plate (PSP) sensors to be easily reused. The black opaque back of the envelope prevents ambient light exposure, preventing image distortion. Simply insert the PSP on the long side of the envelope for easy loading. Available in sizes 0, 1, 2, 3, and 4.