Bridge Pins (brɪ́ǰ pɪ́nz) are small parts used on acoustic guitars to attach one end of the guitar’s strings to the body of the guitar. One end of the string has a ball typically composed of brass that fit into the holes in the bridge of the guitar next to the sound hole. A bridge pin has a smaller end that pushes the string end further into the hole, and secures the string tightly with their larger end, which is too big to be pushed entirely through the bridge. Bridge pins are made of bone or synthetic materials and help to place the strings accurately across the plane of the guitar neck, and are usually about an inch long.