These buffers will be shipped in the original foam lined packing and are not too heavy for shipping. If you have a passive preamp, a volume control, or cd player.. that needs more punch, dynamics, prat, bass tightness and drive, impedance matching.. in general. an audible turbo charge.. these are well worth checking out and getting in your system. They are system dependent and may not help an $8000 cd player much, but really work well in many applications.