Material: Stainless steel and soft rubber, which is lightweight and durable. It can roll smoothly and will not damage your guitar or performance.You can roll the adjustable clip seamlessly to keep the tuning stable without trouble. Just use your thumb to move the roller from one character to another, which will produce different tone changes.These rolling sandhi clips work well with standard 4 to 6 string guitars and are suitable for most string instruments, such as folk guitar, classical guitar, mandolin and banjo.Easy to install and remove, store it on the nut of the guitar when not in use.With the appropriate size and design, the sliding guitar capo can be scrolled up and down with one hand without the trouble of resetting, and it can be easily changed between frames.