From Hudy, this special balancing putty is used to perfectly balance the wheels and tires to reduce vibration. The putty is very sticky to ensure it will not fall off on the track during a run. A must have for properly balanced wheels. The putty can also be used to seal a receiver box, or protect the electronic connectors against water, or even to secure wires to a chassis. 85g putty is delivered in an aluminium Hudy tin box to ensure freshness.