square key; heart-shaped key; aurora finish key with Kanoko Matsukawa logo;

Kanoko Matsukawa is a drummer who collaborates with Mr. Hiroshi Chu Okubo;

here is the video where she plays on cajon in duo with Mr. Okubo: 

https://www.youtube.com/watch?v=uWz8LPH7fu0

育てるドラムチューニングキー / 大久保宙シグネチャードラムチューニングキー

Many thanks to Mr. Okubo for his help in obtaining these keys and for his educational work; thanks Hiroshi!