Manufacturer's Description:
SIP-8F (For RCA input connector, 8 pieces)
Shorting plugs are designed to keep unused inputs from becoming sources of noise, as those inputs are susceptable to receiving stray EMI/RFI noise as well as mechanical resonance. The Acoustic Revive SIP-8F are made of nonmagnetic gold plated brass and 2017 Duralumin. The price listed is for a set of 8 SIP-8F.