Bought both size of Rocketbooks and these pens. These go through ink quickly hence the 4 stars but overall a great buy. I took out the light blue and replaced it with a black pen that came with the Rocketbooks. if you dare to use Frixion highlighters they fit well in the case as well.
If using these for the Rocketbook try to vary your notes color. For stuff that is "formal" that I will share with the team I stick with Black for notes, Red for commands, Blue for explaining commands. If the notes are for me I will use the purple and pink keeping the red/blue for their same purposes.
Using this you get a bit more even wear out of the pens.