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Core Medals are colored O Medals that make up the essence of a Greeed. They can also be used to transform into Kamen Rider OOO or any Combos. Each set of Core Medals comes in a specific color and animal type. Red Core Medals have bird powers; yellow Core Medals have big cat powers; green Core Medals have insect powers; silver Core Medals have heavy mammal powers; blue Core Medals have marine animal powers; purple Core Medals have dinosaur powers; and orange Core Medals have reptilian powers. There are 70 Core Medals total from the series, each three from a Greeed divided in three groupings for the use of OOO: Head, Arms (Torso), and Legs. Important Combos for example - Tatoba, Gatakiriba, Latorartar, Sagohzo, Tajador, Shauta, Tamashii, Putotyra, Burakawani, Super Tatoba and Random Combos.

The OOO Driver is a belt that gives Eiji Hino the ability to become Kamen Rider OOO.The O Scanner is a device that is able to read the energy found within O Medals. By using the O.The O Medals are mystical coins that are at the center of Kamen Rider OOO's powers.