The first purpose-built _______ were made from panels of leather stitched together with a rubber bladder inside. A cloth lining was added to the leather for support and uniformity.A moulded version of the early _______ was invented in 1942. From 1967 through 1976, the _______ used a distinctive red, white and blue _______ that is still seen from time to time. For many years, leather was the material of choice for _______ coverings, however in the late 1990s, composite materials were put forth and have rapidly gained acceptance in most leagues due to their superior performance in harsh outdoor game conditions. A survey in 2007 showed that there were approximately 300 million _______ in the United States.