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In a message dated 1/8/2008 1:23:38 P.M. Eastern Standard Time, [log in to unmask] writes: The last era of vinyl 78rpms can be easily distinguished just because they are very thin and flexible. But other type of vinyl 78rpms, as well as very early LPs, are not flexible and rather thick. I've been wondering whether the last era of thick 78rpms (late 1950s to early 1960s, for example) are actually made either of shellac or thick vinyl. I've seen some postings suggesting styrene rather than vinyl. More brittle, I believe. Don Chichester **************Start the year off right. Easy ways to stay in shape. http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489