Connecting my iphone to the cassette player?

I saw these cassettes in Wal-Mart and they have a wire and you can connect them to your music player and put the cassette in the cassette player.

Do these work well?

Not really unless they align perfectly with the heads of your tape player, plus they are only designed to work in a car cassette player - they are not suitable for a home Hi-Fi (because of the wire). You really need to use an AUX input and get a stereo jack (for the headphone output of the iPhone) to RCA plug cable