This item is one new genuine Matsushita/Panasonic brand, model MS15U2LW1A, quality DC replacement motor for cassette decks made by Sony, Aiwa and others. It has a built in speed control board, 4-conductor interface ribbon cable and operates on 6-15VDC. Approximate shaft size: 9mm long X 2mm diameter. Approximate motor case size: 20.4mm long X 34mm diameter.