Trying to clean up another library disaster last night, and I pulled out my 4th Edition Hackmaster GameMaster's Shield
It's seen plenty of wear and tear over the years and is still in great shape.
There may be GM Screens that are actually hard plastic castles, but this is the ultimate screen for useful information. Come on, it's not just three panels, rather multiple panels that fold out and two panels that flip up to house the d10,000 critical hit charts. I did put velcro on mine to keep everything neat and organized.