[Must haves for Gravity Racing] These weights are very well made. They are smooth polished Solid Carbon Steel with very accurate dimensions. The diameter of the weights are 10 mm which fit nicely in 3/8" holes. They are very non-magnetic. They come in a strong little plastic box.
[Variety of Weights for Customization] They come in five Weights: 1/2 oz, 1/4 oz, 3/16 oz, 1/8 oz, and 1/16 oz. Simply drill a 3/8-inch hole in the body of the car (preferably about 3/4 inch in front of the rear axle), then press the counterweight into it. They fit so snugly that you don't even need to use glue. They'll stay firmly in place.
[Well-machined and Safe to Handle] One major advantage of using stainless steel for these counterweights is that they are easier to polish than tungsten alloy. If you end up overweight and have a little material sticking out, you can take a good file to it and remove a few tenths of an ounce pretty quickly. That flexibility is nice on race day.
[Great Little Derby Car Weights] If you are looking for budget weights and do not want to pay for tungsten, these are a great option for your kid's Derby Car, especially if you have more than one car to build.
[Perfect for The Derby Race!] All you need is a 1cm drill bit. Drill your holes, then press the weights in. You will need to use more of these compared to tungsten because they are less dense, but they are much easier to work with. On race day, if you find yourself slightly over the official 5 ounce limit, you can simply file a little material off to dial it in.
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