Can you describe what thickness these boards are for comic books? How much fabric would you think could be wrapped on one of these boards that is about 7" x 11", without causing the "board" to bend? I tried searching & it doesn't say what thickness they are, although width & height are listed. Prices are all over the place, and materials do differ, although most are listed as acid-free, which is nice. I think for fabric, we want PVC-free as well, if I'm not mistaken.
I have seen the corrugated boards, & I don't want those.