1、The double bass string adopts high quality steel material, solid, firm and durable, ensures a long time service. 2、Reinforced steel string, produces soft, sweet and continuous sound. 3、Four strings per set, enables you to change all the strings of a double bass. 4、Both ends are plated with nickel, can firmly mounted on double bass without damaging the double bass body. 5、Easy to install. Professional musical instrument accessory for double bass. Features: 1.The double bass string adopts high quality steel material, solid, firm and durable, ensures a long time service. 2.Reinforced steel string, produces soft, sweet and continuous sound. 3.Four strings per set, enables you to change all the strings of a double bass. 4.Both ends are plated with nickel, can firmly mounted on double bass without damaging the double bass body. 5.Easy to install. Professional musical instrument accessory for double bass. Specifications: Material: Steel Weight: Approx. 107g Color: black, blue 1st string length: Approx. 158.6cm/62.4in 1st string diameter: Approx. 1mm/0.04in 2nd string length: Approx. 164cm/64.6in 2nd string diameter: Approx. 1.67mm/0.07in 3rd string length: Approx. 169cm/66.5in 3rd string diameter: Approx. 2.1mm/0.08in 4th string length: Approx. 157cm/61.8in 4th string diameter: Approx. 2.75mm/0.1in Packing List: 4*Strings