Rubber Bands

Hello all. I am a new mentor so pardon my ignorance on this question. I looked at the manual and forum and couldn’t find an answer to this question…

I’ve read on the forum and seen teams on youtube using rubber bands for a flywheel or for other purposes on their robot. Looking at the manual in section R7 which details non-Vex components that can be used, I could not find anything about rubber bands. Where in the manual does it say you can use rubber bands as non-decorative components for your robot? Are there other materials that are typically used, like rubber bands, that would fit in this category?

Thanks so much!

I think Vex sells branded rubber bands which can be replaced by other #64 and #32 bands of different brands