Really good pens for practicing lettering and here you will find videos that show the basics of brush lettering where the Pentel Brush sign pen is used. Also very good all-round pens for more detailed writing, headings and illustrations. The ink is water-based pigmented ink and rarely bleeds through on the paper (of course it also depends on the paper). The pens are part of Pentel's sustainability concept Recycology and are made from 77% recycled material.