mousetrap powered car kit

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The Branding Iron
mousetrap vehicle kits | item number: KMTV385DF

The Branding Iron ™

Online Price: $39.95

Availability: This item is currently in stock

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The Branding Iron is going to leave it's mark as it rockets off the start line and skids to the perfect stop at the finish line with ultra sticky foam wheels. The Branding Iron is the most advanced and the easiest to operate braking system available. The Branding Iron has a wing-nut that travels along a threaded axle and then wedges itself against the frame causing the racer to come to an instant stop. The Branding Iron comes ready-to-assemble with pre-cut and pre-drilled parts so you can be ready for action and racing on the same day. As with all our kits, The Branding Iron comes with step-by-step instructions that are filled with tons of top secret performance tips and tricks that have been developed exclusively by Doc Fizzix so that you will have all the information you need to make The Branding Iron a winner.

Why Doc Fizzix:

At Doc Fizzix, we have been designing, making, and building mousetrap powered cars for more than 30 years. Unlike any other mousetrap vehicle kit you will find on the market today, each of our kits has been designed and tested over and over again to insure your success. We use only the best quality parts and components in our kits. We have been featured multiple times in books, magazines, and national aired programs. We wrote the very first book devoted exclusively to the building of mousetrap vehicle selling more than 200,000 copied world wide. Our kits are used in more schools across the country than any other brand. Mousetrap powered cars and vehicles is our specialty.


  • Top secret braking system
  • Ultra Sticky Foam Wheels
  • Light-weight balsa wood
  • Brass tubing axles
  • 12-inch brass lever arm
  • Pre-cut and pre-drilled
  • Doc Fizzix's easy-wind, snag-free propulsion system
The Branding Iron can be assembled in less than 45 minutes for most first time builders and when finished can be set to travel and stop between 1-10 meters. The Branding Iron comes with a 12-inch lever arm making The Branding Iron a good long-distance vehicle without the need for adjusting the lever arm length once assembled.

Braking System:

The Branding Iron's braking system uses a special wing-nut that travels along a threaded axle until it lock tight against the frame of the vehicle causing The Branding Iron to come to an instant stop. Setting the braking system is simple and easy: just place The Branding Iron at the finish line with the wing nut in the lock position, roll the vehicle back to the start line, and now you are ready for racing. Rolling The Branding Iron from the finish line to the start line sets the wing-nut in the exact position needed. The Branding Iron also comes with Ultra Sticky Foam Wheels designed to increase the stopping traction helping the racer to come to an instant stop without skidding.

Sticky Foam Wheels:

Ultra sticky foam wheels are made from a lightweight urethane that is specially designed to grab the road and provide maximum traction for maximum acceleration. While the rest of the field is spinning their wheels at the start line, your racer will be flying across the finish in world record time. These wheels are manufactured specifically for Doc Fizzix Products and are the same wheels that were used on Doc Fizzix's world record setting mousetrap racer that traveled 5 meters in under 1 second. By far, the biggest secret to Doc Fizzix world record setting speed-trap racer was the use of the ultra sticky foam wheels that were essential in keeping his Speed-Trap Racer from spinning out at the start line and providing maximum traction to the road. Ultra sticky foam wheels are 2-inches in diameter and machined to fit a 5/32-inch axle.

As with all our top mousetrap racer kits, Lock-Tight includes our "easy-to-wind" and "snag-free " string release system that will not tangle or snag for increased performance, a technique developed exclusively by Doc Fizzix.

Travel distance:

  • 1-10 meters (1 - 32 feet)* Adjustible stoping distance

Kit includes the following:

  • Victor mouse trap
  • Kevlar high-tech string
  • Pre-cut and pre-drilled balsa wood frame
  • Ultra Sticky Foam Wheels
  • Axle Spacer
  • Brass tubing axles
  • Thrust washers
  • 12" lever arm
  • Top secret braking system
  • Doc Fizzix's easy-wind, snag-free propulsion system
  • Step-by-step plans with performance tips and tricks

Tools required:

  • Needle-nose-pliers
  • Super glue
Size : length = 21 inches, width = 6 inches, lever arm = 12 inches.

Weight : 6.9 oz.

mouse trap car mouse trap car mouse trap car *Kits require assembly, actual results will vary, glue and tools not included.

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Phone Hours: Mon. - Fri. 10:00 a.m. - 5:00 p.m. (CST) - 866-362-3499 (US only) or 512-218-0454
Doc Fizzix Products, P.O. Box 34, Spicewood TX 78669, U.S.A.