Scan-Speak Classic D2008/852100 20mm (3/4”) Dome Tweeter 8ohm, Neodynium Magnet After almost 5 decades of service the highly praised D2008/851100 were upgraded to D2008/852100 with modern materials and to new manufacturing standards, still maintaining its excellent performance as wide dispersion, smooth frequency response and natural sound character. - 3/4" Textile Dome Diaphragm - Wide Dispersion - Dual Rear Chamber - Vented Pole Piece - Neodynium Magnet