Kala Flatwound U•BASS® 4-String Set by Gallistrings, Chrome Steel and Nylon Core, High-Tension Strings for Electric Ukeleles, Double Bass Timbre

Kala U-Bass Flatwound String Set, 4-String (by Gallistrings)

Ernie Ball Slinky Long Scale 6-String Nickel Wound Electric Bass Strings - 32-130 Gauge

D'Addario Bass Guitar Strings - XL Nickel Bass Strings - EXL170 - Perfect Intonation, Consistent Feel, Powerful Durability - For 4 String Bass Guitars - 45-100 Regular Light, Long Scale