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The Hobonichi pencil boards are designed to use underneath the page you are writing on to keep your writing experience even smoother.
The pencil board is extremely useful in case you have lots of decorations on your pages or in the cover pockets, or if you write with a lot of pressure.
The board has a graph pattern ruled into 5-millimeter squares, with one side further labeled by millimeter to act as a metric ruler.
Size W: 88mm x H: 181mm / W: 3.5" x H: 7.1" (excluding index)