This 3-ounce tungsten weight kit from Red Dirt Derby includes an assortment of standard 3/8” diameter weights essential for building a winning pinewood car. The variety of weight sizes allows 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 other metal weights. The kit includes (5) ½ oz weights, (1) ¼ oz weight and (2) 1/8 oz weights.