Suitable for ELECTRIC and ACOUSTIC Guitars. Replaces the 1st / Top E string (the thinnest string) 5 PACK of ball end, unwound 010 gauge steel strings. Tone Deaf Music instrument strings are BRIGHT SOUNDING and have a FULL TONE Strings are INDIVIDUALLY SEALED to ensure they sound great whenever you fit them. Designed to be a stable string meaning they settle in quickly and maintain a fantastic tone for longer.