It's vinyl. I wouldn't set anything hot on them. I used a , forgot the correct term, oven mitt to keep it from melting while I set the brownies tray on them for the pic.

The shortening and vegetable oil used was Crisco, brownie mix Betty Crocker, the walnuts from Farm & Fleet. I don't know what chickens poped out the eggs.

The placematts from Kmart and the table was maufactured by the Watertown Slide Corporation.

So there you have it.