In my experience these are safe and guessing what they
call acid free.
I don’t like the soft thick plastic page holders because of
bleed and they fall out.
I use the 12 page holders and insert 2x2 flips in them.
Most of my my chips I’ve just gone to airtight.
A lot more safe and secure and can be bagged and displayed
nicely in a case or just dumped on a table and sorted.
Better for shipping also.
Amazon has the in cases buy the 100 for cheap.
They come with the foam inserts that you can choose your size
for smal to large coins or chips.
You have to choose and put the foam in yourself
But what a bargain.
Torrey