Pack guitar capo: you will get 2 pack guitar rolling capos coming in black, each of them is approx. 9.8 cm/ 3.86 inch in length, 4 cm/ 1.57 inch in width and 2.5 cm/ 0.98 inch in height, great gifts to your families or friends who like playing the guitar or other instruments . One-handed design: the sliding guitar capo rolls up and down the fretboard without annoyance of resetting it, easily making a change between frets, especially when compared to a traditional style capo When not in use, it could be conveniently parked on the guitar's headstock . No fret buzz: this adjustable guitar capo can roll the capo seamlessly to make the tuning stay stable and won't pinch the sound out of tune Just move the roller from fret to fret by your thumb, a different change of tune would produce . Lightweight and durable: the slide capo is made of stainless steel and rubber, it's approx. 55 g in weight, strong, lightweight and durable The spring provides a right amount of tension, the soft rubber roller won't destroy guitar strings and can avoid scratches, although it may take a little time to adapt to this capo . Fit most string instruments: this rolling capo can work well with standard 4 to 6 string guitars, it's suitable for most string instruments like folk classic acoustic electric guitars, ukuleles, mandolins and banjos But how many strings could the capo use with depends on the size of the guitar neck, please check the sizebefore purchasing.