Kala Solid Body U•BASS® Round Wound Strings by La Bella answer the need for a traditional electric U•BASS® string. Made with a Steel core and Nickel outer wrappings, these Kala Solid Body U•BASS® Round Wounds are a tonally balanced set with a toothy and well-defined mid-range. *Designed exclusively for Kala Solid Body U•BASS® with magnetic pickup. **Not compatible with California U•BASS® models.