ESB 9.1T-28 Novemila Series 1.1 Inch High End Silk Dome Tweeter 110w RMS Pair9. 1T 28 1. 1" 28 mm High End Dome Tweeter TCA System for back air flow control which reduces turbulence, noise, and controls the damping of the dome. Pole cup CNC machined from a solid piece of ultra low carbon steel. Main magnet made from N52H neodymium, best both for the magnetic force in relation to the mass, and for high temperatures support (120 F vs. 80 F of a standard neodymium magnet). Magnet plate made of ultra low carbon steel. Secondary or