For loose-leaf spiral notebooks, most products in the current market have a common problem, that is, the coils of loose-leaf spiral notebooks are prone to scratching. In order to avoid this kind of bad user experience, some Deli spiral loose-leaf notebooks have a specific design for the spiral, and the coil in the middle of the notebook is removed, which not only ensures smooth page turning during use, but also reduces the phenomenon of sticking hands for users.