1. The keyboards are applied to mario arcade game machines.
2. KB-01 is for big mario arcade game.
3. The other type KB-02 is for small mario arcade game.
1. Length: 7.5" = 19 cm. 2. Width: 3.7" = 9.5 cm. 3. KB-01 is for big mario arcade game machine, and has 8 bet buttons. 4. KB-02 is for small mario arcade game machine, and has 9 bet buttons.