SUPERNIL is a nylon core string developed by La Bella for Rockabilly, Slap, Bluegrass, or Country Western Swing. The top two strings are nylon on a nylon core, and the bottom two strings are silver wire on a nylon core. Supernils are sold in fractional size sets, too.
The BLACK NYLON TAPE set features a strong, black nylon tape over a metal rope core. Sometimes referred to as "Deep Talkin' Bass," the black nylon strings are sized for Ampeg Baby Bass as well as Azola Electric Upright Bass.