S=Graph,M=Lined,L=Unlined. Graph Paper Notebook: 4 sets, each 7.48"" x 10.18"" with 160 pages/80 sheets. Dual spiral binding, strong and flexible, lays flat 180degree(s) or folds 360degree(s). 100gsm acid-free thick grid paper, 5mm x 5mm, smooth writing, no ink bleed. hardcover, durable and protective. Suitable for journaling, drawing, college notes, math, engineering, and more. Weight: 8.89 pounds.