Measure and cut a 14 inch piece of balsa wood and label it the base. (Tip: when cutting balsa wood it has a tendency to fray at the ends leaving an uneven finish. To prevent this, cut the balsa wood by pulling the knife toward you similar to cutting a steak with a knife. This will leave a clean cut.)
Warning: keep your fingers away from the blade of the xacto knife as can cut the skin.