Diameter: 4″ (10 cm) Diaphragm: titanium. Coil diameter: 1,5″ (37.6 mm) Resistance: 4Ω Rated power: 251w Maximum power: 501w Frequency range: 2000Hz-22000Hz Magnet: neodymium (N42) Sensitivity: 119 db Set: 2 pcs. Price per set.