Item Weight:8.1 ounces Product Dimensions:1.97 x 1.97 x 7.28 inches Body Material:Plastic Material Type:Advanced Plastic, Metal Size:18.5*5*5cm brand was first established in 2017 as a musical instrument e-commerce platform. With a young and energetic team, we are able to search all kinds of unique, useful, high-value musical instruments design from Chinese brands at the beginning of it for anyone who is interested in music, expressing themselves through music. Today has grown far beyond the store, and we'll be introducing more original products in the future, so keep your eyes open for updates. These new models and features embody the innovation of , hope it can inspire your passion to create music, immersed yourself in new technology and to have fun. [3-in-1 Guitar String Tool] Including electric string winder, string cutter, pin puller, it makes changing strings easier . The powerful knob groove is suitable for most guitars, bass, ukulele, mandolin and other bass. [String Winder Function] Electric string winder make string changing faster and more convenient, saving nearly 80% of the time. Powerful knob groove can adjust the rotation direction at will, you can install or remove the strings easily. [String Cutter Function] After professional heat treatment, the blade can easily cut thick strings and thin strings. [Pin Puller Function]The unique design of the pin puller can pull out the nail easier without damaging the bridge. [Rechargeable Battery] Built-in 3.7v, 750 mAh rechargeable lithium battery, comes with a charging cable, you can quickly charge , It can be used for 4 hours per full charge. You can put it in a backpack and take it wherever you want to go.