These highlighters have a water-based ink and trace lines that are 2 - 5 mm wide

which keeps it easy to carry along to a class or a coffee shop

Tip: polyacetal fiber brush tip

The barrel is polypropylene with an airtight cap that helps stop the ink from drying out in storage

Camera Obscura & NICE Crew

uni pin fine line brush pen Colors:Light Grey These highlighters have a water-basedThe Uni Pin brush pen uses a flexible synthetic fiber tip rather than a fixed width fineliner nib, so the line varies with pressure push down for a broader fill or medium width script, lift up for a fine detail line, all from one pen. That range makes it suited to expressive hand lettering and brush style titles rather than the consistent monoline a technical fineliner produces. The ink is uni ball's archival "Super Ink," a water based pigment formula