The big fad toy of 2000 was the scooter, with approximately five million sold that year. These foot-propelled devices, a spin-off of the 1950s models, were made of lightweight aluminum and used tiny, low friction wheels similar to those on in-line skates. Weighing about ten pounds, they could be folded up and easily stored. Yet the scooters were relatively dangerous until operators became skilled at riding them. From January through October 2000, more than 27,000 people (mostly young males under the age of 15) were treated for scooter-related injuries.