To distinguish between two-key and three-key keyboards, we use "Dango" (rice dumplings) and "Cherries" ^ - ^ They are also very helpful during trial lessons! ・Dango x 4 sheets, Cherries x 4 sheets (8 sheets total) ・Laminated!! They can be stood up on the keyboard, so they won't get in the way! They can be used repeatedly ♪