Our meager contribution to your P.E. curriculum - rugged, durable, and FUN! We've had ours for years and they're still rolling! Use outside on a flat surface, down in your basement, and even on your not-too-plushy carpets. We chose models with handles for added stability (Our children like to attach jump ropes to the handles and give each other rides). Wheels are non-marring and seat is a generous 12" square. Large Scooter Boards are 16"x 16" and do not have handles. We've even used them to move furniture and other heavy objects around the house. Did I say they were strong and durable? A favorite toy-tool in our house - hopefully in yours, too!