These are designed to be pushed on to the RCA socket, while the housing is loose. You then tighten the housing, at which point they grip tightly on to your RCA sockets, giving a very secure and low-loss connection.

Inside the plugs, the pure silver wires connect directly to the silver-plated centre pin, in a solderless connection - reducing losses still further.

The result of all this is further improvements in sound quality over Ultimate Silver Dream in systems which are highly-resolving. There are gains in absolute transparency, openness and freedom. The differences are relatively subtle, but become obvious in high-end systems.