Pyrex glasses in plastic holders, I remember them from the 1960's/1970's I also remember the pyrex glass ware such as dishes, plates cups etc.
Pyrex was developed by the American Glassmaker Cornings in 1912. Borosilicate glass would not crack or shatter when put in the oven. I remember pyrex ware more often than not in a white colour with various patterns such as the one above, floral etc.
You will notice the back mark JAJ on many items, The initials stood for James A. Jobling. He accquired the rights to produce pyrex in 1922. His Factory was in Sunderland UK, Sadly this plant closed in 2007.
Below are 2 cups made in Holland which i think are probably copying the pyrex design.