Cards purchased from Seria, Daiso, etc. Various sizes are available. 21x15: 6 sheets 16x12: 4 sheets 15x10: 10 sheets 14x10: 7 sheets 13x9: 2 sheets 10x8: 7 sheets Perfect for the new life starting in spring! Why not change your interior cards to match your mood every day? For room decor For decorating your planners and notebooks Stored at home in a case. Please consider this with your understanding.