CD-ROMs were created in 1985 by Sony and Philips as a format for storing large amounts of digital data using the same basic design as an audio CD but allowing data to be read from the disc rather than just music. Discs are made of polycarbonate plastic with an aluminum reflective layer and can hold large software programs, videos, and multimedia files. Other popular 1980s inventions mentioned include disposable cameras meant for single-use photography, roller racers which were scooter-like toys ridden by shifting one's weight, and pogo balls which combined a pogo stick with a bouncing ball platform.