This M5 (Micro 5) size system notebook cover features an attractive, gentle, pale blue color. It uses a soft, leather-like material that feels smooth and comfortable in your hand(´꒳`). The simple yet elegant design suits both business and personal use. The ring diameter is approximately 22mm, a large size that can securely hold thick refills. You can use it freely for scheduling, household budgeting, life logging, and more. Enjoy creating your own unique notebook by combining your favorite refills. The cover is slightly thick but soft and easy to open. It's a nice feature that allows you to write stably on a desk. There are slit pockets inside for smart storage of cards and memos. The size is easy to carry around and won't take up much space in your bag. It's perfect for both paper refills and "paper x digital" management, using it in conjunction with digital tools. It's also convenient for organizing memos and to-do lists. When shipping, we will take measures to prevent water damage and carefully package it to prevent deformation. It is stored with care in a dark, non-smoking environment at home, so there are no odors or discoloration. It's also recommended as a sub-notebook for those who already have Mini 6, A5, or Bible size notebooks. With its soft color and high-quality feel, it's a notebook that will make managing your daily schedule a little more enjoyable＾＾