It opens flat on any surface and allows you to flip effortless from sheet to another. We use recycled, acid free and pH neutral paper that is safe to use and resists unwanted yellowing over time. Easy and convenient to carry and use, you can bring it to outside. Compatible with: pencils, ink, crayons, pastels and so on; The watercolor paper can be sent to person who like acrylic painting, watercolor painting, sketch, etc. Size: 21x14.8 cm.