13 mm tweeters Max Power: 140W RMS Power: 100W Frequency response: 5 - 22 kHz Efficacy: 91 dB 1W/1m Impedance: 4 Ohms Silk membrane Crossover: 6 db/oct. Three mounting options Dimensions: Outer diameter: 33 mm Mounting hole: 16 mm Depth: 20 mm Price per set