Poly-Planar MA-4054 4" 80 Watt Speakers - Black [MA4054B] Mid Layer The carbon flange is

The carbon flange is

This is the same technology from the same manufacturer which is successfully employed to protect commercial broadcast and television towers from direct lightning strikes

UPC: 652480200755

Installs with six #8 FH fasteners (not included)

Length - 2"

Poly-Planar MA-4054 4" 80 Watt Speakers - Black [MA4054B] Mid Layer The carbon flange isMA 4054 4" 80 Watt Speakers Black MA 4054 is a 4" cone size two way coaxial speaker. This speaker featured a rugged waterproof design, Teflon coated wires, plastic grills, polypropylene cones, mylar tweeters and plastic frames, to provide years of trouble free service. Ultra low magnetic field speakers eliminates the problem of speakers magnets affecting navigation equipment such as compasses and autopilots. Features: Ultra low magnetic field speaker