newly made precups

[knakki]

After trying to find some information on which precups would be best for my application, I found an ebay auction of what looks to be newly machined sets of precups in all flavors. Has anyone had any luck with these or similar ones? Are factory ones made of a particular material that make them better than remans?

I know factory ones are suppose to be non ferrous, what would they be made of? better at withstanding heat? I'd imagine thats why there so cheap is because there probably not that great of a product?
I'm not sure if I'm allowed to post external links or not, but for research purposes here is the auction.

http://www.ebay.com/itm/Brand-New-D...Parts_Accessories&vxp=mtr&hash=item3cce8c896a

 

[ak diesel driver]

I've heard Inconel is the material in the stock ones. the machining of the diamond cups on your ebay link looks a lil ragged to me

 

[knakki]

I didnt zoom in on the photos but thought they looked a little too shiny, but zooming in.. yuuckk they look terrible.