The Modern Fuel mechanical pencil is precisely machined from a solid piece of aluminum or brass on a CNC lathe, making it extremely strong and durable, and is then finished by hand to remove the appearance of all seams. We are so confident in its quality and manufacturing that Modern Fuel Design offers a lifetime guarantee for each and every pencil. “If there are any issues with your pencil, send it back to me and we will fix it or make you a new one,”