Bridge pins are small, cylindrical pins that hold the strings in place on an acoustic guitar. They are typically made of plastic or bone, and they are inserted into the bridge of the guitar.
To remove a bridge pin, you will need a pair of needle-nose pliers. Gently grip the pin with the pliers, and then twist it counterclockwise to loosen it. Once the pin is loose, you can pull it out of the bridge by hand.