Easy to store and carry: Each sliding guitar capo comes in proper size and light weigh, will not burden your string instruments and can be kept in a bag easily. Easy to change the tone: These sliding guitar capos allow to make a change between frets, helping you to get a proper tone you want. Wide usages: You can use these rolling capos to tune tones of folk classic acoustic electric guitars, ukuleles, mandolins and banjos, etc. Practical gifts to share with your families or friends who have string instruments, bringing convenience to them. Specifications: Material: stainless steel and rubber Size: 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 Color: black Package includes: 2 x Guitar rolling capos Warm notes: How many strings could the capo use with depends entirely on the size of the guitar neck, so please check the size before purchasing. It may take a little time and practice to adapt to this capo, please be patient.