Tone color is thick.Strong durability. The surface of the alloy is multilayered.Long time is not oxidized. Suitable for senior guitarists. Adopt medium carbon steel hexagon core and full automatic winding technology, smoother and softer. The nickel-alloy material makes the sound more plump and . 4pcs/set VX120 Bass Strings 040-100 Nickel Alloy Vigorous Tone Strings Model: VX120 Inner Material: Hexagonal Core External Material: 10 % nickel alloy wire Color: As picture shows Size: G: 040 inch / 1.02 mm D: 060 inch / 1.52 mm A: 080 inch / 2.03 mm E: 100 inch / 2.54 mm Material: Hexagonal Metal Core Product packaging size: 18*15*1cm Package Contents: 1* bass Strings (4pcs/set) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.