Bat Kings is an insert set in 2004 Donruss Baseball. This 8-card set features game used bat chips from current major league stars and retired greats and uses Diamond King artwork from previous Donruss sets. Cards 1-4 are cards of current stars and are numbered to 250 copies. While cards 5-8 are cards of former greats and are numbered to 100. The base level cards are paralleled by a Studio set with 1-4 serial numbered to 50 while 5-8 are limited to only 25.