The Red Dirt Derby RDD002 90ml tungsten weight kit includes an assortment of standard 1cm diameter weights essential for building a winning pinewood derby car.The variety of weight sizes allow for incremental weight increases and precise placement necessary to achieve maximum speed.Weights are made from safe, non-toxic tungsten offering superior density compared to lead and zinc weights.The kit includes (5) 1/2 oz weights, (1) 1/4 oz weight and (2) 30ml weights.Red Dirt Derby products are expertly engineered for the Boy Scouts of America's Cub Scout Pinewood Derby race.