
to CCF
Most modern flips are safe, but there are still flips out there with polyvinyl chloride - PVC - the bad kind.
If you have any questions you should probably call the seller, as long as you're buying from a reputable company they'll be able to answer the question.
You can also invest $5 and buy a package of safe flips, then carefully handling the coin only by the edge transfer them. That will give you some peace of mind.
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/