ETI Research BP-50C Binding Post (par)The ETI Research BP 50C Binding Post is a very high performance Binding Post at an entry level price. Made from 1100 series Hardened Copper with an IAC Rating of 102% you can be assured the audio signal is not being degraded having to go through a poorly conductive material such as Brass. CONDUCTOR Gold Plated 1100 Series Copper HOUSING Brass (Black Finish) ETI Research has spent countless hours developing and fine tuning the BP 50C to ensure audio