[FTC]:

can other vex parts be used like the metal. Surprise we still have vex pieces

Yes, as per <RM01> b. All post-processed materials are allowed provided they are readily available to the majority of Teams from standard distributers (e.g. McMaster-Carr, Home Depot, AndyMark, etc.).

We used VEX parts extensively on our FTC robot last season.

For official Game Q&A post here: http://ftcforum.usfirst.org/forum.php