These are extra JOIA mallets for playing tubes individually. JOIA is pronounced "Joy" "Ah!". JOIA is Brazilian Portuguese for Bright, Brilliant, Clear and Shining! Features include rich deep resonant tones to high pitched tones, and pentatonic, diatonic & chromatic scales. Explore rhythm with self expression and improvisation as never before. These tubes are great with a band or as a solo instrument. From beginner to profe...