Ink is much easier to read when you’re completing a crossword or sudoku puzzle but it can get messy if you make a mistake. These pens combine visibility with ‘erasability’ thanks to a clever eraser-like tip that makes the ink disappear. Supplied in a set 3 – one black, one blue and one red – they’re also handy for letters, notes and expensive cards for special occasions you don’t want to spoil with crossings out.