At the end of every sound bath Koshi chimes are often the most talked about.
 
Koshis are available in 4 different melodies, inspired by the four elements:  Earth (G C E F G C E G), Water (A D F G A D F A / Pentatonic), Air (A C E A B C E B) and Fire (G B D G B D G / Pentatonic).  Each has its own magical timbre and can be played harmoniously with all the others.