Bienfang 10×10 Graph Paper is available at Amazon.com.
10×10 – 8.5×11-inch pad. Also available in 11×17-inch pads.
Better than 4×4 or 5×5, 10×10 allows you to render hand-drawn graphs and charts (or floor plans, etc.) in fine detail.
The high-quality paper takes any type of pencil, ink, or marker without bleeding. I use a Sharpie Felt Tip pen (.4mm fine point) and couldn’t be happier!