55-sheet quadrille pad: Includes 55 sheets of quad-ruled 4x4 graph paper in 11 x 8.5 inches (letter size). 4 squares per inch grid: The 4x4 layout (4 squares/inch) is ideal for note taking , math , technical drawings , and engineering sketches . Thick paper, clean results: Made with thick paper to help prevent bleed-through , so you can confidently use both sides . Sturdy writing support: Features a hard, sturdy cardboard backing to keep pages stable while writing—great for desks, clipboards, or on-the-go work. Easy tear pages: Top perforation allows for easy, clean tearing when you need to hand in assignments or remove a sheet neatly.