Everyone participates and it is fun. The car is a perfect size for regular playing cards or the small cards provided. The downloadable English pdf is thorough and the cards provide what you need for the trick that a beginner can do.

The instructions show how a regular deck of cards can be used and search Penguin for Juan Tamariz's excerpt of El Cochecito.
It's a great presentation. You'll know how it's done, but spend the $5 for Juan's instructions.

The Koornwinder Kar has a feature where the car can be handed out (the suggestion is not to...just let them grab it) where they can't make it stop at all.

You'll see in Juan's video where he uses a flat surface rather than the mat he has in place. One reason is that he can push and release the car and it will stop. I've found that on a mat the back and forth adds a car length or two unless the car is pressed down hard. This extra distance can easily be factored in. A small box is provided for transport and the tiny cards take up little space. Just plain magic fun.

This is the best version. This is one of the cutest magic effects of all time. I remember seeing this trick on Worlds Greatest Magic when I was a kid and always wanted on of these little cars. Pair this with Tiny Plunger for a fun routine with tiny props. The lock/unlock feature of this gimmick sets it dramatically apart from its peers.

i love the koornwinder kar, i purchased 2 of them 1 of them worked. but the other didnt wont to work. but overall its a neat trick.first time i saw it, it was on worlds greatest magic. juan tamariz is a super awsome magician.

This item is now my #1 favorite by Tenyo, having displaced 'Mr. Danger' on my current list. Truly, I believe that if you dedicate even minimal practice time to make your presentation smooth, you will be rewarded with an effect that will amaze, as the tactile feedback from the Kar when it stops can really give the impression of having a mind of its own! I've witnessed eyes widening and slightly nervous giggles occurring--never a bad thing when you're looking to impress!

Bottom line: Buy it. You won't be disappointed.

This item is now my #1 favorite by Tenyo, having displaced 'Mr. Danger' on my current list. Truly, I believe that if you dedicate even minimal practice time to make your presentation smooth, you will be rewarded with an effect that will amaze, as the tactile feedback from the Kar when it stops can really give the impression of having a mind of its own! I've witnessed eyes widening and slightly nervous giggles occurring--never a bad thing when you're looking to impress!

Bottom line: Buy it. You won't be disappointed.

I HAD SOME PROBLEM PUTTING IN ACTION THE GIMMICK IN A FLUID MOVEMENT...