Red Dirt Derby 2-ounce tungsten putty (2 containers, 1 oz each) is extremely dense and is great used for weighting fishing lines and fine tuning weight in Pinewood cars. Pinch off as much/little as you need. Moldable with fingers into any shape needed. Offers superior density and is made from safe, non-toxic tungsten and polymer. Safe for the environment. Tungsten putty is reusable. When not in use, store in resealable plastic container.