Tungsten cubes are the top choice in Pinewood Derby Weights for maximum performance. They allow the builder to create extremely dense weight pockets in the lower rear portion of the car for maximum energy and stability. Their precision tolerances allow them to be stacked tightly in any desired configuration for thin and narrow bodies. The Derby Worx 2 oz. Tungsten Cube kit contains 12 high density / polished 1/4” tungsten cubes, perfect for adding weight in small areas of thinly designed derby cars.