Heavyweight watercolor paper in economical packages work well for groups and classrooms. No stretching is required. These sturdy, 140 lb. sheets are perfect for wet and mixed media. UCreate Watercolor Paper is acid-free and recyclable.Heavyweight watercolor paper in economical packages work well for groups and classrooms. No stretching is required. These sturdy, 140 lb. sheets are perfect for wet and mixed media. UCreate Watercolor Paper is acid-free and recyclable.