The pads are glued on top, and include 20 sheets of 140 lb. (300gsm) paper, a versatile weight to maximize uses. This product is characterized by an extremely deep black color, thanks to the high quality and lightfast pigments that are used for its production. Flexible and resilient, BLACK BLACK is ideal for pastel, color pencils, markers, paper crafts, portfolio presentations and mat boards. Although not recommended for pure water techniques such as gouache and watercolor, the heavier weight takes light water media.