What are small gold colored "caps" that came in bag with perfect path products?


I recently upgraded my Pre/amp/CD player and cables so I'm just now getting around to evaluating some perfect path products I bought.  In the bag with alpha e cards and thing you plug into outlets are several small gold colored objects looks like a cap to something, but it is not obvious what.  Anyone know what these are ?

Thanks for your time.
berner99
Just cover the open RCA jacks with copper foil. Also, is anyone suggesting something other than RFI/EMI rejection is going on here? For example, if the caps are used to cover unused RCA jacks on unplugged components.
What about holons and morphic fields? How do you eliminate information fields? I mean, besides you being in the room.
RFI. Let’s look at the wavelength of 1 Gigahertz wave for a second. It’s about 0.2 meter. So we can rule out all RF 1 GHz and below fitting into the opening of an RCA jack, let say it’s 3 mm. The hole diameter is too small. Pop quiz: at what frequency and above will RF fit into the opening?
millercarbon"What about holons and morphic fields? How do you eliminate information fields? I mean, besides you being in the room.

This is a vile, unwarranted, unnecessary personal attack, insult, and derogatory statement perhaps MC thinks this is clever, witty, or amusing but I find it to be none of those but instead a poor reflection of MC's motives, intent, and purpose in this forum.
We all know he’s a jerk. He can’t help himself. It’s a form of inferiority complex. Either that or a really bad case of the 🍑