Silk Crayons Is A Fun Set Of Eight Vibrant Colouring-In Pens For Children.\N\Nsilk Crayons Go On Silky Smooth Like A Pastel, But You Can Change The Look By Simply Adding Water With A Paintbrush, To Create A Water Colour Effect. Colours Are Brighter Than Normal Wax Crayons.\N\Nsilk Crayons Are Non-Toxic, Odour Free And Water-Soluble So Stains Can Be Easily Washed Out. The Extra Fun Bit Is That Each Crayon Comes In A Twist-Up Tube, So There Is No Mess And No Waste.