Thunder Brushes are the number one preferred performance replacement Thunderjet motor brush of throngs of T-Jet racers across the country (and perhaps even the world).  If you demand proof, simply look at the "Car Tech" sections in the Paperboy and Octorara Hills race re-cap pages.  All (or almost all) of the racers there use Thunder Brushes, and those that don't make sure they have them for the next race.

You can order Thunder Brushes directly from JB!  Thunder Brushes are sold in packages of 12 (6 pair) for $12.00.  Shipping is free!