These Derwent Watercolour Pencils can create a wide variety of effects, as they can be used wet or dry or on wet or dry paper. They have been highly pigmented to ensure maximum colour purity and are fade proof so they will last a long time. These pencils have a 3.5 mm strip of lead, so they can be used to draw thin lines or shade thick. A hexagonal barrel gives you greater control over your work. The water-soluble strip is encased in California incense cedar wood which ensures easy sharpening. There are 24 pencils in this pack.