The ETI-Research BP-20C Binding Post is a superb high-performance Binding Post available at an entry-level price. Made from 1100 Series Hardened Copper with an IAC Rating of 102%. You can rest assured the audio signal is not being degraded by having to go through a poorly conductive material such as Brass. Copper is far superior to Brass in terms of conductivity and as such the BP-20C offers a level of audio signal quality unsurpassed in similarly priced competitor products. If you want a binding post representing outstanding value for money, this is it.