An erasable colouring pen in 12 assorted colours which means if you don't like something, simply erase it with the attached eraser stud and re-do. The unique ink also responds to heat generated by rubbing with the eraser and goes clear, allowing you to colour over again or leave blank. Washable pens are water-based and ink may wash out of clothes.
Water soluble pens mean that the ink is water-resistant after drying and will not wash out easily.