SDESIGNED TO PROVIDE A HIGHER GRADE OF PROFESSIONAL RECORDING; UNSURPASSED ELECTROMAGNETICS IN TERMS OF SIGNAL-TO-NOISE; TAPE AND MACHINE HEADLIFE ARE MAXIMIZED BY A COMBINATION OF THE ESPECIALLY SMOOTH OXIDE SURFACE AND PERMANENT LUBRICATION; CONTROLLED WIND BACK TREATMENT MAKES TAPE SCRATCH-RESISTANT AND DISIPATES STATIC CHARGES TO IMPROVE TAPE PATH TRACKING;CASSETTE WIND CHARACTERISTICS REDUCE GENERATION OF TRANSIENT DROPOUTS AND RESIST PHYSICAL DISTORTION; PROFESSIONAL GRADE