1. Application scenario: Dongmi refill 007 is a thin refill, usually suitable for 0.5mm or thinner pen tips, suitable for meticulous writing, such as signature, drawing, tick mark, etc. , suitable for occasions requiring high writing accuracy. Dongmi refill 009, on the other hand, is a medium-thick refill, which is usually suitable for a nib of 0.7mm or thicker, and is suitable for ordinary daily writing, such as taking notes, writing and filling out forms. Writing speed is faster.

2. Smoothness: Dongmi refill 009 is smoother than 007.

So the choice of refill mainly depends on your use needs. If you need to write more detailed content or higher writing accuracy, you can choose Dongmi refill 007; If you need ordinary daily writing and pursue faster writing speed and fluency, you can choose Dongmi refill 009.