CS-J420X 10cm (4") 2-Way Coaxial Speakers Features: 2-Way Coaxial 210W Peak/21W RMS Power Frequency Response: 45 - 22,000Hz Sound Pressure Level: 90dB/W.m 10 cm (4") Mica Cone Woofer 2.5cm (1") Poly-Ether Imide Balanced Tweeter Ferrite Magnet (Woofer) Neodymium Magnet (Tweeter) Hybrid Surround Mounting Depth: 43.1 mm (1-23/32") Specifications: Woofer Size 10 cm (4") Diaphragm Mica Cone Surround Hybrid Surround (Rubber & Cloth) Magnet Ferrite Magnet Tweeter Size 2.5 cm (1") Type Balanced Diaphragm Poly-Ether Imide General Power Handling Capacity (RMS power) 21W Power Handling Capacity (Peak power) 210W Frequency Response 45 - 22,000Hz Impedance 4 ohms Sound Pressure Level 90dB/W.m Weight Weight (w/o Grille) 0.23kg (0.51lbs) Magnet Mass 74g (2.6oz) Mounting Depth 43.1 mm (1-23/32")