VM-01 5" Woofer 10 oz Magnet Voice Coil : 1" ASV Frequency Response:90-20 kHz Sensitivty:90 dB Impedance:4/8 Ohm RMS Power:40 Watts We have many models of car speaker component kits;profession speaker component kits; Loudspeaker Components and GPS , with high end good quality and best prices . If you are interested in our products ,please feel free to contact us . OEM/ODM service :available