These erasable pens are invaluable if your crosswords or Sudoku puzzles get a bit messy, or your diary or calendar is full of crossings out. They use special smudge-free gel ink that can be rubbed out just like pencil, so you can keep your writing neat and error-free. How do they work? Apparently their built-in erasers turn the gel ink transparent and therefore virtually invisible.

• Set of 6 retractable fine-tip pens
• Each pen contains ink cartridge and eraser
• 2 each of Blue, Black and Red ink
• Pack contains two of each colour
• NB not recommended for legal documents where writing needs to be permanent