Made from high-quality muting materials, soft and durable without scratching the fretboard or strings. String dampener helps reduce unwanted noise and overtones caused by vibrations during practice and performance. Easy to install and remove, and fastens securely on the guitar. When not in use, it can also hold picks. Metal size: 8 x 1.2 x 1.2 cm, plastic mute size: 8 x 1.8 x 1 cm. Easy to use and does not require tools or special installation. Universal and adjustable design makes it a great training tool for guitar beginners. Color: Black + Silver Material: Metal + EVA Package Contents: 2 x Guitar Fret Strings Mute Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement error allowed is +/- 1-3 cm.