One 10 inch polypropylene cone with a butyl rubber surround on a reinforced ABS baffle. High output and maximum efficiency with an accentuated 70 Hz peak to maximize listener's low-frequency experience. Extra-large Sound - Tube-specific 12.9 liter steel deep can for quality bass response. Rapid-installation, blind-mount, fixed-wing mounting mechanism with constant-tension design affixing to ceiling thicknesses ranging from 0.25 inch (6.4 mm) to 1.91 inch (48.5 mm). Easy-access five-position tap switch for 25-, 70.7-, 100-volt and transformer bypass position. Steel grille with protective powder-coated finish for lasting durability plus a tool-free strap for easy installation. Baffle-mounted, flared and tuned port for maximum efficiency and frequency response. UL 1480 (UEAY) and 2043, CE (EMC Directive 89/366/EEC, EN55020, EN55013) approved. Included accessories: Color-coded (purple) tile bridgeGrilleUL-rated cover plate - Four-pin Euroblock - Paint shield - Restraint cable