This Ink-Redibles Mess-Free Activity Kit is currently available in the 2 for £20 Offer at The Works. The activity set is available for £15 online. However, you can get two of them or mix and match two different sets for £20, which is a fantastic deal.
The set includes six different magical colourburst markers that only reveal colours when used in the colourburst book and posters. The set saves you the hassle of mess from colouring pens. We found it available online at The Works.