Each Aqua Blend pencil has a class-beating 4mm thick core of pure artist's quality pigment. They produce an absolutely flawless laydown of lightfast colour that will blend away perfectly when you add water. Highly pigmented & fully water-soluble, these Aqua Blend pencils produce strong lines & bold colours that will blend & diffuse effortlessly, with no residue or staining. They're a super-convenient way to enjoy watercolour sketching & colouring. & what's more, they work just as well as coloured pencils costing twice as much! Available in 120 colours, singly & in sets.