Kit includes: 4 - 4.5" Diameter Dome-style high-density poly dust caps. For voice coils up to 3" 1 Bottle of premium, professional-grade CRC rubber dust cap adhesive **Adhesive must cure minimum of 36 hours before running speaker. Perfect for woofers, subwoofers, and car audio. These parts are used by manufacturers, professional reconers, and sub builders for recone or repair.