Percussion Plus 15-note duo rainbow outdoor metallophone15 note outdoor metallophone on metal base The 15 note outdoor metallophone offers a playful and engaging way to explore tuned percussion. Diatonically tuned in C Major (C4C6), it delivers a wide range of expressive tones. The thoughtfully arranged concave layout, with the lowest note at the centre and notes descending on either side, makes it intuitive to play and the colourful rainbow design encourages group participation and playful exploration.