Two-Way 100 mm (4 in) Co-axial Ceiling Loudspeaker. 100 mm (4 in) high output driver with polypropylene cone and butyl rubber surround and 19 mm (3/4 in) soft-dome liquid-cooled tweeter, 74 Hz – 20 kHz bandwidth, wide 120° coverage, 87 dB sensitivity. Blind-mount backcan for quick and easy installation, dual conduit/cable clamp for in and thru cables. Combined 25 W multi-tap transformer at 70V/100V and 8O direct setting (30 W). Black. Sold as each, packed in pairs. International master pack is 2 speakers.