Possibly dangerous auction

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Mddeming-at-aol-dot-com>

Hi All, 
The following eBay Items look to me like electrolytic caps. If so, and he is
advertising them for Tesla coil use, he's selling something which may well blow
up in the recipients' face first time it's used. 
Tesla coil capacitors 400v 220uf NEW 40,000v Item # 1721890101 
       Can anyone tell for sure what they are? 
Would it be ethical to warn buyers? seller? eBay? All of above?
Thanks,
Matt D.