Features: Domestic silk sound film: The vocals are sinister, delicate and soft, natural and smooth, with distinct layers and a strong expressive sense of hearing. Ferrosound Magnetic Fluid: Improve dynamic linearity, reduce voice coil temperature rise, effectively reduce thermal power compression effect, reduce distortion, harmonic distortion and sound coloration Aeromagnetic strong magnet: Improve the electroacoustic conversion efficiency of the speaker, increase sensitivity, expand the voice coil stroke, and increase frequency extension. Product name:4 inch Silk film HIFI tweeter dome driver Parameter:104MM Impedance: 8 Ohm Power: 30W-60W Panel size.104MM Magnet size:70MM Diagonal screw pitch:92mm Magnet thickness:15mm Material: plastic colour: As shown Package Contents: 1 x 4 Inch Tweeter Speaker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.