Our EP riser pads are made of hard plastic. The design helps avoid wheel bites, making tricks easier to land and can preserve your skateboard deck by reducing the risk of stress cracks where the deck and the trucks meet. Our riser pads will increase your deck height and decrease shock felt in your feet, while not interfering with your speed. When you install your EP riser pads, you of course want to install four screws, one on each corner. However, you might notice that there are a total of six holes in skateboard riser pads. Why is this? Easy People Manufacturers conveniently put an extra set of holes in most riser pads to accommodate both new school and old school skateboards & adjustable longboards.