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Upgrade your HPI BLITZ truck with this Gear Box Set (Gray) from the high performance BLITZ ESE truck. This replaces the stock black nylon gear box set with stiffer composite parts. Not only does the gray material enhance the performance and style of the truck, it lets you know at a glance which parts are the high response performance parts. These parts are precision made to exact HPI factory specifications for a perfect bolt-on fit.