The Red Dirt Derby 3.5 ounce tungsten weight kit includes an assortment of standard 3/8” diameter weights essential for building a winning pinewood 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) ½ oz weights, (3) ¼ oz weights and (2) 1/8 oz weights. All Red Dirt Derby products are expertly engineered for speed.