The Kala Rumbler is the latest model in Kala Brand's distinctive line of award winning portable U-BASS instruments. The Rumbler takes the U-BASS into a new dimension with the addition of custom engineered electronics and new proprietary strings, at an economically friendly price. The Rumbler design integrates a specially designed Kala electronic system with a Piezo pickup and is equipped with an active EQ with built in tuner. Each bass is strung with Kala Silver Rumbler Strings which are proprietary U-BASS strings designed and manufactured exclusively for Kala Brand Music by Aquila strings. Padded gig bag included. Die-Cast U-Bass tuners, Laminate Mahogany construction, Mahogany neck with Rosewood fingerboard and bridge.