I love these pens in order to draw my designs. For Zentangles they are super useful, The black is fed, the ink runs absolutely smoothly, the tips do not tend to fray. The sturdy box is very convenient. There is a competing product, the better I a very small (!!!) Tick think it's also almost twice as expensive. As regards the price-performance ratio, the Staedtler-liners are likely unbeaten why unter'm stroke I give them preference.
