I want to know the answer to the following question:
What was Metrolite and Sav-o-flex materials primarily used for?
All the background I'm provided with is that "Later, Decca Records introduced vinyl Deccalite 78s, while other record companies came up with vinyl concoctions such as Metrolite, Merco Plastic and Sav-o-flex, but these were mainly used to produce "unbreakable" children's records and special thin vinyl DJ pressings for shipment to radio stations.". Is that enough to answer the question?