These essential components are rubber loops that transfer motion from the motor to the various rotating parts within a cassette deck or other tape-based device. This rotational energy is critical for functions like playing, rewinding, and fast-forwarding tapes. Different sizes and thicknesses are required depending on the specific model of the device.
Proper function relies on the elasticity and grip of these loops. Over time, they can become brittle, stretched, or broken, leading to malfunction or complete failure. Replacing them is often a simple but crucial maintenance task for preserving the functionality of vintage audio equipment. The development of these components was integral to the widespread adoption of magnetic tape technology in consumer audio.