These are a custom pair of San Francisco Trans Tower Speakers. They are crafted from italian Pietra Del Cardoso Stone. The drivers are manufactured in Israel by Morel and are designed for tri-amplification or external crossovers (not included). Speakers are internally wired with Cardas. Frequency response is 44hz-22khz and power handling is 150w rms. These are exceptionally well built and the sound is extraordinary. Shipping is estimated for each individual speaker.