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Peanut Butter Jar Lids, wrapped with a rubberband.
They work really well for "popsicle stick engineering" type projects.
See attached picture of my ME212 project.
It was designed to carry unpopped popcorn kernels across a 36" chasm. We had to start within a 16x16x6" box, and could only use certain materials. The whole thing could only be powered by 2 rubber bands. We could use up to, 2 triggers (1 to deploy the bridge, one to release the car).
We designed a bridge/car, and more than doubled the closest competitor. (we got 4632g of popcorn across).
Note: the bridge is inspired by a FIRST robot. Heh.
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In the interest of full disclosure: I work for VEX Robotics a subsidiary of Innovation First International (IFI) Crown Supplier & Proud Supporter of FIRST
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