Kevlar is used as a material in more than 200 applications, including tennis rackets, skis, boats, airplanes, ropes, cables, tires, and bullet-proof vests.[2] During the week of Kwolek's death, the one millionth bullet-resistant vest made with Kevlar was sold.[17] Kevlar is also used to build cellular telephones; Motorola's Droid RAZR has a Kevlar unibody.[18]