The unique see through tip eliminates blind spots so you can see what you're highlighting as you mark for straighter lines and more precise highlighting. Smear Guard ink specially formulated to resist smearing when highlighting over many pen and maker inks (includes written notes, faxes, copies, newspapers and more- let ink dry before highlighting). Bright, see-through colors make your highlighted text easy to read. The versatile, easy glide chisel tip is great for highlighting, underlining or writing notes. It makes both thin and wide lines.