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The design comprises a 100 mm (4.00″) polypropylene full-range driver and 0.75″ ferrofluid cooled soft dome high frequency driver mounted in a UV and weather resistant UL 94-V0 and 94-5VB ABS front with a plated steel fire can enclosure. Dust protection is provided in the form of an attractive powder coated aluminium mesh grille. The mineral loaded polypropylene cone material and butyl rubber surround enhance durability and long-term reliability. CVS 401-BK is specifically designed for applications requiring the combination of excellent music and speech sound quality and exceptional reliability.