TDK PRO SM60 Professional High Bias Audio Tape (60 min) (Discontinued by Manufacturer) Professional Studio Master Cassette Analog Audio Cassette/Iec Type Ii, High Bias Multi-Track Originals & Masters, Stereo Mix-Down Demos TDK PRO SM60 Professional High Bias Audio Tape (60 min) 4.5 x 3 x 0.5 inches ; 3.4 pounds