Derwent Procolour coloured pencils combine the best of the Artist and Coloursoft ranges. They feature the strong, break-resistant point of the Artist pencils and the smooth laydown that you get with the Coloursoft.The covering power is akin to that of wax, but the colour glides on with the ease of oil. Combine that with a great range of shades and you have pretty much the perfect colouring pencil! Cylindrical barrel and 4mm break-resistant core.