Parts of cassette players

SPOOLS

["Round components that hold and wind the tape inside old music devices."]

The clue "Parts of cassette players" refers to the physical components that hold the tape inside a cassette. "Spools" are the cylindrical parts that the magnetic tape winds around, making them a key part of how cassettes function. The answer is straightforward, with no wordplay or hidden meanings—it simply names the specific parts being referenced.