To maximize performance, Pinewood Derby cars should be weighted to the maximum weight allowed. Tungsten weights have 3 times the density of traditional weights to give you finer control about weight distribution. PineCar #P3923 EZ-Cut Tungsten Weights can be easily cut, carved and sanded. Package contains weights totalling 2 ounces (56.6 grams). Choking hazard - not for children 3 or younger.