A reinforced skateboard deck adapted to connect to a set of trucks and wheels to form a skateboard for riding with the deck having a reinforced region constructed to resist rupturing of the deck and a protective side barrier constructed to prevent wear of the reinforced region during use. The spectral response of the device is cyclic. As a result, the magnet is able to rotate at higher speeds without fracturing. Further, by utilizing the broadcast program storing system, a data storing apparatus that stores data received from a TV, a radio, or through the Internet, efficiently and automatically, can be realized by using a magnetic tape or a random access recording medium such as a HDD. The user places the said device on a flat surface. Disclosed are methods for operating a bidirectional sealing blowout preventer to seal a well around a well pipe against downhole pressure to control the well, and to seal a well around a well pipe to pressure test another blowout preventer or other apparatus in a stack.