rubber band racer kit

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The Sling-Shot
rubber band racer kits | item number: KRBR925DF

The Sling-Shot ™

Online Price: $15.95

Availability: This item is currently in stock

bulk order special available for this item

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The Sling-Shot is the worlds fastest rubber band powered racer and will travel a 5-meter distance in less than 1-second. The Sling-Shot success comes from it's ultra-sticky foam wheels and it's unique pulley launch system that is designed to maximizing the transfer of potential energy into the kinetic energy with almost no loss of energy. The Sling-Shot Kit 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 Sling-Shot Kit 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 Sling-Shot Kit a winner. The Sling-Shot takes a bit work to build than other rubber band racer kits and some cutting and drilling may be required by the builder.

Why Doc Fizzix:

At Doc Fizzix, we have been designing, making, and building rubber band powered cars for more than 30 years. Unlike any other rubber band 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 rubber band vehicles are our specialty.


  • Pulley launch system
  • 2-inch ultra sticky foam wheels
  • Light weight design
The Sling-Shot uses our all new revolutionary pulley launch system that is designed to maximized the potential energy of a stretched rubber band into kinetic energy with almost zero loss of energy. The secret to the pulley launch system is that it is designed to stretches the rubber band instead of winding it as is common with other rubber band vehicles; this system will double the power output and double the torque of the system causing the vehicle to "rocket" off the start line with an almost unfair advantage.

Ultra Sticky Wheels:

The biggest challenge with all high-speed racer is wheel traction, if wheels do not have enough traction then the racer will spin it's wheels at the start wasting precious energy. The Sling-Shot Racer comes with two ultra sticky foam wheels that are made from a lightweight urethane that is designed to grab the floor and provide maximum traction and acceleration. While the rest of the field is spinning their wheels at the start line your racer will be flying across the finish line in record time.

As with all our top rubber band racer kits, The Sling-Shot Kit 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 Speed:

  • 5 meters in less than 1 second*

Kit includes the following:

  • Rubber band
  • Kevlar high-tech string
  • Balsa wood frame
  • Ultra Sticky foam wheels
  • Low inertia front wheels
  • Brass tubing axles
  • Thrust washers
  • Pulley launch system
  • Doc Fizzix's easy-wind, snag-free propulsion system
  • Step-by-step plans with performance tips and tricks

Tools required:

  • Super glue
  • band saw or jewelers saw
  • X-Acto knife
Size : length = 21 inches, width = 6 inches, lever arm = 12 inches.

Weight : 4.1 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 5507, Round Rock TX 78683, U.S.A.