These artist quality colouring pencils give depth of colour and are easily blendable to achieve different tonal effects lay down two colours or more on top of one another starting with the lightest colour work each pencil in a new direction to ensure a smooth build up of hues and tintsthe coloured strip inside these colouring pencils is more fragile than ordinary graphite pencils and requires extra care when sharpening to protect the pencil strips from breaking a good metal sharpene