This notebook is a birthday present for my little brother. It's made from 18 gauge mild steel.incompetech.com. I cold bent the hinge with a hammer and pliers. The hinge pin is a piece of rod that I built up on the ends with weld. The N is written in weld and then ground flat, and I also ground off the sharp edges all around. The graph paper part took a bit more than an hour and the metal part took two and a half hours.