ETI Research Kryo Spade (par)The ETI Research Kryo Spade Connector is made from Tellurium Copper and Silver Plated for not only superior conductivity but long lasting durability. The housing is made from Brass for greater vibration damping and high EMI RF noise rejection. CONDUCTOR Silver Plated Tellurium Copper HOUSING Brass (Black Finish) This combination of high quality materials and precision manufacturing adds up to the highest standard of audio connectors designed for use