I decided to make the best and cheapest race numbers ever.

Tape sounded too silly for me, so I decided to make magnetic ones. These would be removable without any trace of their existence, and easy to apply during an autocross.

The problems with magnets as follows:
-They'll scratch the car
-They're black.

I solved both these problems by sewing the segments of magnetic tape inside of a piece of cloth shaped like the letter. It turned out fantastically! The white cloth made it incredibly visible, didn't let the magnet scratch the car, and held all the pieces together nicely.

All you need is a sewing machine, some thin cloth, and Magnetic Tape:




Here's a "cross section" of the 8. You can see the magnets inside the cloth:



Final Product:



And look at what visibility we've got:



I'm all ready for tomorrow's AutoX! Now I've just got to convince the parents, and get some gas money. It's in Toledo, for those nearby.