BTR 10 strings for electric guitar. Thickness 10-13-17-30-44-52. The material used for winded strings is nickel. The strings are handmade and coil to the end. Sounds are more versatile, with the sound is sharp enough for rock, metal or modern blues. They have a distinctive attack and amazing Sustein for a chord game. Surprisingly, at heights and bass, they have a pleasant steel and sound character. They will last for a very long time.