In 1938 Gillette introduced the Thin Blade, which was cheaper and about half the weight of the Blue Blade, even though it cost almost as much to manufacture. The Thin Blade became more popular than the Blue Blade for several years during the Second World War due to high demand of low-cost products and the shortage of carbon steel. Beginning in 1939, Gillette began investing significant amounts on advertising in sports events after its advertising in the World Series increased sales more than double the company had expected. It eventually sponsored a radio program, the "Gillette Cavalcade of Sports", which would move to television as well as that medium expanded in the late 1940s. While the "Cavalcade" aired many of the notable sporting events of the time (the Kentucky Derby, college football bowl games, and baseball, amongst others) it became most famous for its professional boxing broadcasts.