This collection mainly focuses on the Sakura Pens. More specifically, the Pigma Micron pens. These pens work well in just about any paper. My mom normally uses them to write and stuff at work. Mainly, these pens are to draw comics and the like. The width of the lines does affect the final version of the drawing. So, if you are looking for a cool, and useful art pen. I have all the different sets available. There is also some that are just to buy one width in specific. I personally mostly use the .03 and .01 pens. The .05 is more for like thicker lines. The .005 I rarely use. This pen is like super fine. The lines are for delicate parts, like when you draw feathers or something like it. So, if you want to draw Mangas like they do in Japan, Sakura Pigma Micron is the collection for you.