Made to go with the
Reprolabels Sticker Set, this replacement head converts Combiner Wars Optimus Prime/Motormaster into Thunderclash/Machine Wars Optimus Prime.
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Replacing Optimus's head requires prying the original head apart which may not be reversible without glue. To apply the replacement kit, paint the kit, then pop the head onto the ball-joint. The head is designed to work as a single-part.