Specific competition legal rubberbands?

my team and I were thinking about using a catapult that would work with rubberbands to launch the disks and I was wondering if there were any specific types of rubberbands we had to use for the competition or if there were any illegal types of rubberbands or any elastic.

the game manual states what kinds of non-vex products are legal.

look for <r7> specifically

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