Each squeegee blade can be used in all four directions for increased lifespan. You can use the front side of the squeegee, then rotate, so the back side is facing forward. Then, you can flip it upside down, and use both of those surfaces. This squeegee system is revolutionary, because of how easy it is to change your squeegees. No tools are required to switch your blades, and can easily be done within a few minutes. We recommend rotating your squeegees every 20 hours of scrubbing, so they wear evenly.