Pebbles cereals are a line of breakfast cereals made by Post (now Kraft Foods) since 1969. They are made with flavored rice, and their packaging features characters from The Flintstones. The two best known are Fruity Pebbles, introduced as Pebbles in 1969, and Cocoa Pebbles, introduced in 1970. Other varieties include Dino Pebbles, which included marshmallow pieces, and Pebbles Boulders, which have either a caramel apple flavor or a chocolate peanut butter flavor.