alvision 4 The form is similar to some of the tactical pens, with gnurled metallic grip and a metallic clip. The only complaint I have is against the 3 colored dots which act as indicators/selectors, the dots look too 'cute' and the printing of one of the inner circle on my pen was off by about 0.5 mm. Also, the eraser under the cap is quite ugly to be honest, a good thing it's hidden under the cap.Function wise this pen is slightly inferior to Pilot's Frixion 4 in 1 pen. However, I like the switching mechanism. Although it takes an extra step to switch between colors, it won't be as tedious once you get used to it (can be done by one hand), and it has the added benefit of preventing accidental switching or retraction prone in the other systems. So far the ink flows smoother and is easier to erase than Frixion's ink.
C. Davis 2 10本入れの箱から無作為に抜き取って装着した1本は、しばらくは快適に書けたのですが、突如インクの出が非常に悪くなり、薄くなったり、かすれたり???これまでこんなことはなかっただけに残念です。別のものに替えたら、それは問題なく今のところは快適に使えています。いずれにせよ、製品にムラがあるのはいただけませんね。