For an expert or a student. These pens are high-quality yet inexpensive and will take your sketches to the next level. These marker pens are water-based and water-resistant after drying. There are 9 tips available, from 0.05 fine tips for precise lines to 0.8 brush tips for thicker and bolder lines. Buy one or buy a few with different tips for different purposes. All the different pens have black ink.