One of the best-selling strings since their introduction in 1962, Super-Nils are the strings for "slap" style used in Rock, Rock-a-billy, Bluegrass or Country & Western Swing. They have a very flexible feel and produce a great sound. 3/4 size (standard size bass) only. G & D are nylon mono filament wound on nylon multi-filament core. A & E are wound silver-plated copper on nylon multi-filament core.