A saddle is a component on a guitar’s bridge that acts as a spacer for the strings. The saddle also aids the transmission of string vibrations from the bridge to the soundboard or pickups. On acoustic guitars, saddles are usually made of plastic or bone, and are glued into the bridge. With electric guitars, the saddles are typically metal, and affixed to the bridge with screws. Saddles can also be adjusted on electric guitars to correct intonation problems or make small adjustments of the string action.