Revell Pinewood Derby Tuning Set/Speed Kit
This handy Tuning Set has everything you need to get the best possible performance out of your Pinewood Derby racer. The included Wheel Truing Mandrel improves speeds by making your tires as round and smooth as can be, while a bonus, 16-page Raceday Log/Tips and Tricks book is packed with helpful hints for race day. Adult supervision recommended for the Wheel Truing Mandrel and the graphite powder.