Formerless VC, Ferrofluid cooled, Light and compact and suitable for auto or home use. Round flange version of the Tw010F1.

This is probably the most copied tweeter in recent times. The flangeless version was used in millions of auto sound coax systems.
Imp - 8 ohm
SPL - 90dB
Fs - 3000Hz
Flange 74mm
Cut-out 48mm
Depth 14.4mm