[Chris_Ely]

Originally Posted by Pendulum^-1

Polyurethane cord has proven to be useful for making lightweight mechanisms to transport game pieces within a robot.

http://www.mcmaster.com/#59725K704

Typically, 1/4" diameter works well for many applications. You form it into a loop by welding the two ends of a length of cord together, using a small open flame to melt the ends of the cord, then placing them together, aligned, for about a minute. A little tricky, and takes a few tries to get the technique down.

My team used the hollow core belt with the quick connects without fault in 2012. Works well and the belts can be taken apart without cutting them.
Either one will work though.