S = Pack of 24 M = Pack of 36. Administrative Professionals Day Gift: 24 pieces of tree notebooks in 12 different shell colors, 2 pieces of each color. Each notebook has 64 sheets, 128 pages. Sufficient quantity for daily use, great for school or office. Tree Design: softcover printed with a tree surrounded by birds and butterflies, giving elegance and calmness. Soft and comfortable surface for pleasant touch experience. Nice Writing Experience: made of quality paper and soft Pu leather, safe and reliable, preventing ink from leaking. Multiple Applications: suitable for school, office, home, for taking notes, sketching, planning, drawing pictures. Weight: 9.77 pounds.