Ooly Switcheroo! Colour Changing MarkersCan never have too many felt tips? We couldn't agree more and these pens knock all others out of the craft drawer. Switch Eroo Colour Changing Markers surprise and delight with one regular colour and one 'mystery' colour in each pen. First, your kid colours in with the normal tip, then they use the mystery colour change side (white tip) for a wonderful transformation. Adding an extra artsy layer that's sure to spark even more creativity whenever they