The Derby Car Supply 9 Piece Fine-Finish Polishing Kit (#773119) by Roadway Racers is an unassembled kit designed for children aged 5-7 years. This intermediate-level kit includes sandpaper, a magnifying glass, and a file for perfecting the finish of a derby car. Manufactured in 2018 in China, this kit is part of the Cars theme and is perfect for young car enthusiasts looking to customize their own derby car with professional tools.