Hahnemuhle's Akademie Aquarell Watercolor Books feature 30 sheets of acid-free high-longevity paper. Their natural-white 90 lb. (200gsm) paper has a fine grain surface structure on both sides, ideal for creating full width panoramic paintings. A companion for artists who love to capture their memories without delay. Artwork is protected with a durable cover and a rubber band to hold the cover together.