The Smith Corona Lift-Off Correcting Cassette Tape Cartridge H21060 H63412 is a typewriter ribbon supply specifically designed for the Smith Corona PWP series typewriters. This unit is a genuine product from the brand Smith Corona, manufactured in Mexico. It is a correcting cassette tape cartridge that offers lift-off technology to provide accurate and precise typing while also correcting any mistakes made during the typing process. This product is essential for businesses and offices that rely on typewriters for their daily operations.