Construction Party Happy Birthday Jointed Letter Banner. This 7 foot long banner is made of bright yellow pressed cardboard. Happy Birthday is spelled out in yellow with a big red dumptruck cutout in the middle. The top is a black and yellow construction stripe print. Each letter is jointed together with a grommet for easy flexible positioning. The letters are 5 inches long. Combine with our other Construction party supplies for a complete look. One Construction Party Happy Birthday Jointed Letter Banner is 7 feet long.