Function: 1. The double bass string adopts high-quality steel material, solid, strong and durable, ensure long service. 2. Reinforced steel string, produces a soft, sweet and continuous sound. 3. Four strings per set, allow you to change all the strings of the double bass. 4. Both ends are nickel plated, can be firmly mounted on the double bass without damaging the body of the double bass. 5. Easy to install. Professional accessories for double bass musical instruments. Specification: Characteristics: 1. The double bass string adopts high-quality steel material, solid, strong and durable, ensures a long service life. 2. Reinforced steel cord, produces a soft, sweet and continuous sound. 3. Four strings per set, allow you to change all the strings of the double bass. 4. Both ends are nickel plated, can be firmly mounted on the double bass without damaging the body of the double bass. 5. Easy to install. Professional accessories for double bass musical instruments. Data technical : Material: steel Weight: approx. 107g Color: Black, Blue Length of the first string: approx. 158.6 cm / 62.4 inches First string diameter: approx. 1 mm / 0.04 inch Second cord length: approx. 164 cm / 64.6 inch Second string diameter: approx. 1.67mm/0.07in Third string length: approx. 169 cm / 66.5 inch Third string diameter: approx. 2.1mm/0.08in Fourth Cord Length: Approx. 157cm/61.8in Fourth string diameter: approx. 2.75mm/0.1 inch Packing list: 4*strings