Hey there, race organizers and parents! Getting ready for the big Pinewood Derby? This 'Full Monty' kit has EVERYTHING you need weight-wise for your 1/4 scale car. It's a complete set of tungsten weights - which is awesome because tungsten is super dense, so you can add a lot of weight in a small space to hit that perfect 5-ounce limit. The kit comes as an unassembled model kit, with gray-colored weights, suitable for ages 8 and up. It's brand new from TxW brand. No UPC, but who cares when you've got the secret weapon for speed? This takes the guesswork out of balancing your car. Just follow the rules, get creative with placement for optimal center of gravity, and watch your car fly down the track. A must-have for serious competitors who want every advantage.