This string set includes 4pcs strings, fit for 4 string bass. It is made of steel which is very and durable. These 4pcs strings measure about 0.1 inch, 0.08 inch, 0.055 inch and 0.04 inch in diameter. Great replacement for your broken, dirty or old guitar strings. Sure to make your guitar look great again! 1 set of 4pcs steel stringsCompatible with 4 string bass guitarDiameter of String: Approx. 0.1 inch, 0.08 inch, 0.055 inch, 0.04 inch (2.5mm, 2mm, 1.4mm, 1mm)Good tools to replace your guitar string, good gift for guitar beginnerEach string is individually packaged in its own bagMaterial: SteelColor: Silver Package Includes: 1 set of 4 bass strings Note: Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the color of the website's photo and the actual item could be slightly different.