The Essential colour pack has 16 colours including all the classics and a few extra purples, pinks, greens and greys. This pack includes the colours any artist needs to create vibrant art. Strong and versatile 0.5-0.8mm flexible brush tips allow for both thin and thick brush strokes. The flexible nibs will help you reach all the grooves, tiny spaces and uneven surfaces (such as shells, wood, rocks, etc). Filled with highly pigmented acrylic paint, the colours flow smoothly out of the pen and through the brush tip onto any surface you can think of. These are fantastic for all ages and are very well suited to small kids too! Paint on virtually any surface with these pens including rocks, wood, glass, ceramic, terracotta and paper. Non-toxic, water-based and easy to clean!