Do you need a to do lots of erasing? Then you look at Mono Graph and Twist-erase. Both have the function of an extra-long eraser that is turned forward as you use it. Mono graph is available as 0.5 but on Twist-erase you can choose between 0.5 and 0.7. With Mono graph, you shake out pins easily and on Twist-erase, you feed pins onto the body of the pen where you have the grip when you write.
Looking for a pen with a super thin lead? Then the given choice is the Pilots H-323 with a pin that is only 0.3.
Looking for colored pencils? Then you should look at Color Eno, available in lots of colors. We also have the colored pins for these pens.
Super Grip are affordable classics from Pilot. You can also choose between 0.5 or 0.7 or if you want to add a bit of glamor with tastier colors on the pens.
Finally refills with the leads available as 0.3, 0.5 and 0.7 as well as colored.