Not hard plastic. Flimsy plastic - thinner than postcard stock
I am going to have to order from a different source.  I thought it was be fairly rigid plastic but it is essentially a very thin card stock.  Very hard to use.  It's just a little thicker than the film used on an overhead projector (if you remember those).  Another point of reference - the plastic it is thinner than a post card.  A postcard thickness would actually be a huge upgrade.  I hate to send a bad review on anything but this thing is really thin, which renders is almost useless.
Rating: 3 stars