This is the AquaTint by Spectrum Noir (3PK) – Falling Leaves.
Create beautiful colourings and designs with the new Spectrum Noir AquaTint Pens. Each AquaTint pen is filled with bright water-soluble dye-based ink, dispensed through a fine nylon brush. Colour can be applied as accurately or freely as you wish, then blended out with water for an amazing result every time.