This unique product is a collection of 786 high quality pictures of more than 100 balsa wood bridges. Several pictures from different angles were taken for most of the bridges, including the front, top, side, and upside down views. There are several sets of pictures in pdf format, and they include a wide variety of designs. There are many bridges that are quite strong and have attractive designs. A few other bridges used too much or too little balsa wood, have poor designs, or do not look good.