Zebra Sarasa pens are great gel pens. I prefer the 0.7 mm tip because it gives a smoother, more consistent line than the thinner tips. I'm not really fond of the scratchiness of the 0.4 mm pens I own. My current favorite color of this collection is Mahogany. I really like brown inks, and the reddish tint adds to the uniqueness of the color. I think it's cool that 10 pack includes colors not commonly found or seen as pen (ink) colors, such as cobalt, frost, and mahogany. The only flaw - these 0.7 pens don't dry fast enough - at least on Clairefontaine paper - so beware of smearing! Luckily, I didn't observe this problem with other paper, such as my Mead Cambridge notebook.