Features: Perform and record clean timbre without unwanted string noise. Easy to use, no tools or special installation required. Fastener design, easily adjust the force required by the muffled sound, when idle, can be conveniently pushed to the guitar head. Suitable for live performance and recording studio, saving both time and labour. Professional accessory for 7 strings acoustic guitar, electric guitar, classic guitar, bass or other guitars with wider fingerboard, and also applicable to 6-string guitar. Specifications: Color: Black / Red / White (Optional) Material: ABS+neoprene+cotton Item Size: 190 * 30 * 24mm / 7.48 * 1.18 * 0.94in Package Weight: 18g / 0.63oz Package Size: 15 * 11 * 3cm / 5.91 * 4.33 * 1.18in Package List: 1 * String Muter