The quality of the popular Nana Mimura Concerto Series has also been given an even better brush. The same yarn as the Concerto series, with a firm weight head that is similar to the regular series, and it achieves an increasingly thick and glossy tone. Especially the bass mallet has been greatly reduced contact sound on the keyboard and mallet to produce a denser richer, more clear sound and surround sound. It is especially recommended for those who are looking for basics, heavy and rich sound. The 7 level width provides ample coverage for 5 octaves, and is adjusted to the appropriate weight and firmness for each range.