The core

[sena]

Is there any pm apart from Au in these...?

 

[martyn111]

Those are refered to as flat packs on the forum, use the search button at the top of the page to find previous discussions of their contents

 

[samuel-a]

Pd and Ag are likely to be found in traces amounts... Don't know exactly how much of each.

 

[Claudie]

I believe the solder balls have a good percentage of Silver in them.