True CD quality digital audio. Sony's PDP series Pro DAT employ professional grade metal digital tape. Sony's PDP series has more variations in a "PP (Polypropylene) Case" that protects the cassette and the high quality DAT sound inside. The PDP series employs ultrafine "Crystal Art" magnetic particles, which deliver high retentivity and outstanding output. HD&R Binder System, (High Dispersion & Reliability), enables high-density packing while maintaining flexibility and durability. Together with the specially developed backcoating, it also helps to keep error rate low even after multiple plays.