A brand new good quality German made square section rubber drive belt for use in old retro cassette tape players and cassette decks.
Unless we have tried and tested a belt in a specific machine (which will be mentioned in the item title), we are unable to provide specific information on which belt size will fit any particular make or model of cassette unit.
To find the the belt size you need, lay out your old belt in as perfect a circle as you can and measure the internal diameter.
For square section belts, the width and the thickness are the same.