1989 Topps Teenage Mutant Ninja Turtles Stickers #7 Cowabunga! PSA Graded is a non-sport trading card featuring a sticker of the Teenage Mutant Ninja Turtles character with the catchphrase "Cowabunga!" It is part of Series 1 by Topps and is from the franchise of Teenage Mutant Ninja Turtles. The card was manufactured in 1989 and is a collectible item for fans of the popular cartoon series.