Blocks are sealed on all 4 sides with small unbound area to help separate finished artwork from the next sheet. This intermediate grade watercolor paper is popular with watercolorists of all levels because of the fine and even washes that can be achieved using this sheet. It also has a strong surface that will allow lifting and scraping applications. The natural white color and traditional cold press surface make it an ideal sheet for mastering watercolor techniques or for finished artwork. Block measures 15″ x 20″ and contains 15 sheets. 140lb weight.