KRE-O Transformers Age of Extinction Custom KREON Lockdown Set (A7838) Build 16 different versions of your Lockdown KREON with the 30 pieces in this custom KRE-O construction set! More than 16 different combinationsIncludes pieces for weapons Use your imagination to construct vehicles, buildings, robots and more Many KRE-O sets include bricks with special features that add to the fun KRE-O construction sets come with colorful, step-by-step guides