Swiss Audio SAF320, 3.5" (8.7cm), 2-Way Koax Speaker 20W RMS 40W MAX Impedancy: 4 Ohm Frequency response: 150Hz - 20kHz 8oz. Magnet Efficiency: 91dB @ 1w/1m 3/4inch Alu-Neodymium Tweeter Silver Woven Fiber Cone"ICED" Silver Basket 2-way ASV Voice coil Depth: 1 3/4inch