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QUAD-RULED – Set of four 9-3/4 x 7-1/2 inch thread-bound, wireless 80 sheet/160 page, quadrille 4 x 4 graph paper composition books with 4 squares per linear inch, perfect for plotting math equations and creating graphs.
DURABLE – Sturdy hardcovers, front and back, with black covers; pages are thread-bound for extra strength