Hi sweetie,
I know this sounds bad mentioning ACID but they don't have any ACID in them.This is the type you look for to keep your fabrics like new.
Acid free means it won't harm your fabrics because the boards won't yellow with age. That also means they are PH neutral free of Acid.
They won't get moldy. I have my fabrics in our basement and wrapped on these boards and they are great.
We pay so much for our fabrics that you want them to last and be organized too and the boards are great.
PM for more information if you like to know more. I love theses boards. if you want me to send you a pic. of my fabrics on the boards I very willing to do that.