They're RCA caps treated with some of their magic type stuff. Just one of the many nice little gifts Krissy liked to sometimes throw into orders. I got some and as I recall they come in two different versions. One is just a cap or cover, the other is a grounding cap and you can tell because that one has a male pin in the center. Looks just like an RCA plug. Both versions go on unused RCA plugs. Both versions make a nice improvement, and I was surprised to find they worked even on a CD player that I never use. In other words the CD player is connected to the system, but not selected, and yet listening to the turntable the sound was better with these things on the CDP!
Real simple just put em on and enjoy!
Real simple just put em on and enjoy!