Folding Magnetic Dry Erase Learning Project Scrum Whiteboard, 12" x 18", Folds to 9" x 12", Set of 10 by Foam Phonics

I would like to be able to attach one of these to a large format poster at a scientific conference. How much does each 12 x 18 sheet weigh? Thanks.

do these lapboards have magnets inside them? would they stick on a big whiteboard?

How thick are these when folded?

can these be cut?