A baseball card is a type of trading card relating to baseball, usually printed on cardboard, silk, or plastic. In the 1950s they came with a stick of gum and a limited number of cards. These cards feature one or more baseball players, teams, stadiums, or celebrities. Baseball cards are most often found in the U.S. mainland but are also common in Puerto Rico or countries such as Canada, Cuba and Japan, where top-level leagues are present with a substantial fan base to support them. Some notable baseball card producing companies include Topps, Upper Deck Company, and Panini Group. Previous manufacturers include Fleer (now a brand name owned by Upper Deck), Bowman (now a brand name owned by Topps), and Donruss (now a brand name owned by Panini Group). Baseball card production peaked in the late 1980s and many collectors left the hobby disenchanted after the 1994-95 MLB strike. However, baseball cards are still one of the most influential collectibles of all time.