square key; heart-shaped key; aurora finish key with Yoshiko Nakagawa logo;

Yoshiko Nakagawa is a marimba player who collaborates with Mr. Hiroshi Chu Okubo;

here is the video where she plays on marimba "The Flight of the Bumble Bee" with Mr. Okubo on drums: 

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

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!