Features: Used to reduce noise while you practice guitar without disturbing others. The inner side is designed with a soft sponge, which does not hurt the guitar strings. Easy to install and remove, no tools required, effectively lock the strings without worrying about the muffler falling down. Effectively reduces a large amount of sound and retains a portion of the sound, suitable for most different string gaps. Screw locking design, adjustable tightness to change the sound intensity. Specifications: Materials: Plastic, Sponge, Copper Color: Black/Purple/Blue/Pinks/Green Size: as shown in the picture Package Includes: 1pc Guitar Muter note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.