Gain a competitive edge and make your Pinewood Derby® racer run faster. Install by drilling a 0.4" dia. hole into your racer, and then use the included double-sided tape to safely secure the weights to your car's chassis. Drill and pliers required. Includes: One set of 1.8 oz. Stick-On Designer Weights, Double-sided tape. Length: 2.8". Width: 0.3". Weight: 1.8 oz. Age: 8+