Fits for: Suitable for 38-41guitars with steel strings Accessories: 12 hole acoustic guitar soundhole pickup is a great musical accessory for amplifying the sound of your guitar. Features: Designed with and volume controls for more accurate pickup, and cables and jacks are also provided. Sound Effects: Produces clean sound quality with low feedback,back clip protects guitar from any scratches Easy Installation: Just insert the pickup into the prong and clamp the left side of the prong, then tighten the right side of the prong with a wrench to connect the wires from the bottom of the guitar to the amp and speaker. Size Chart: 23cm/9.06inch Package Includes: 1Guitar Pickup Note: Please allow slightly errors due to manual measurement and different monitors.