This loudspeaker unit apply to home theatre system, professional audio and compression drive Features: DIY tweeter voice coil home theater systems, professional audio and compression drives. High reliability and low consumption. The is , the distortion is small, and the treble is clear and transparent. Made of titanium film, durable. With terminal block, convenient wiring. Specification: Coil material: imported copper clad aluminum round wire Coil bobbin: Kabitong KSV Voice coil inner diameter: 34.4mm/1.3 in Terminal center distance: 74mm/2.9in Aluminum sheet outer diameter: 63mm/2.5in Ball top height: 5.5mm/0.2in Sound film material: Titanium Film Resistance: 8Ω Power: Comparable to original power depending on magnetic steel conversion efficiency Package list: 1 * 34.4mm Tweeter Voice Coil Note: The measurement allowed error is +/- 1-3cm. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.