This Aquadoodle Thick Thin Pen Set lets lots more busy hands enjoy hours of mess-free colouring and drawing fun.Fill the Aquadoodle pens with water, run the nibs over the Aquadoodle mat (sold separately) and see your lines and designs appear – it’s magic!No mess, no ink, no stains – once the water has dried, drawings fade away, ready to start all over again!Set includes two pens, 1 with thick nib and 1 with thin nib, easy for little hands to handle.Suitable for ages 18 months and over.