Description: and This is a 2 roller string trees. These string retainers are the type with the little rollers on to help stay in tune and help prevent strings from breaking. They come with 2 mounting screws as . Great replacement for your broken, dirty or old string retainer. to look great on your guitar! A pair of roller style guitar string retainers. The rollers on can lessen the stress on your strings, which allows the guitar to stay in tune . They also can prevent wear and tear on the strings, which results in string life. Compatible with electric guitar and . Base Size (L x W): . 0.43 x 0.23 inch / 11 x 6mm Height: . 0.47 inch / 12mm (including the roller) Roller Size (L x D): . 0.4 x 0.2 inch / 10 x 5mm String Spread ( to ): . 0.27 inch / 7mm Material: Metal colour: Black Package Contents: 2 x guitar string retainers(with screws) 1 x Guitar boat socket Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.