1) louder sound of it 2) High quality woofer 3) Offer OEM service 4) Made in China

FNX-CT13:  3/4"(19mm) Silk Dome Tweeter 

•Flush and angle surface mount hardware with 360° swivel function

•Ferro fluid cooled and hi-flux neodymium magnet

•Chrome screw terminal

•Impedance: 4 ohms

•Frequency response:2k-20k Hz

•Power rating: 70 watts/pair

•sensitivity: 90dB

car tweeter