The Magnadyne LS515C 5-1/4 INCH speaker is sold as a pair and can be purchased in black or cream. This speaker has the ability to produce 50 watts RMS power handling, 100 watts maximum power handling, 80Hz-18kHz frequency response, and 4 ohm impedance. The speaker also has Rubber suspension, Polycarbon cone, 1 Inch aluminum voice coil, 1/2 INCH piezo super-tweeter, and 1 INCH mylar midrange. In terms of measurements, this speaker has a Mounting hole requirement: 117mm, 4-5/8 inches diameter, and Mounting depth: 48mm, 1-7/8 Inches.