Aquila Silver Rumblers for UBass
KALA U-BASS and Aquila Corde team up to bring you SILVER RUMBLERS.  Using Aquila's patented  technology and formulas,  SILVER RUMBLERS are engineered  specifically for the Kala U-Bass. Their special Nylgut compound includes calcium carbonate to give them  increased  density, stability and the ability to resonate tone at very low frequencies. SILVER RUMBLERS are pure bass, clear tone and a low end that earns them the name "Rumblers".