Two sides of each triangular Artline Stix marker or pen is covered with an identical pattern of hollows and bumps. Combined with the indentation and protrusion on either end, each Artline Stix marker or pen can be snapped together vertically or horizontally to any other, enabling Stix to be played with like construction blocks, used as connected drawing and art utensils, or carry around in a convenient bundle. Colour: Yellow, Orange, Pink, Red, Magenta, Blue, Light Blue, Yellow Green, Green, Apricot, Brown, Black