These Growth Chart Rulers are an excellent way to measure and record children’s height. They are made to scale and are actual measurements. We make them about 6 inches shorter on the bottom so when you screw them (screws are not provided) to wall the base board trim won’t get in the way. You can use a tape measure or ruler to get the growth chart ruer to he right height and screw to the wall. Boards are made of pine and numbers are engraved. the ruler is approximately 7.5″ wide by 72″ tall and it’s about 3/4″ thick.