Good quality Glass wool (fiber) used for proper sound absorption. A pair of Speak-on connectors is given for input and output for another setup. Metallic back plate with proper marking of connection for easy installation. Metallic handles for easy to carry or convenience. High-quality adhesive and chrome polished nails are used for strong joints.Acoustically designed speaker for best indoor or outdoor Performance. Best quality solder used for strong connection between joints. Custom made design suitable for Professional use and produces soothing sound. The item "5 Core 18 Inch PA DJ 600 W RMS PRO Wooden Sub Woofer BOX Passive COLUMN 8 OHMS" is in sale since Saturday, December 12, 2020. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Speakers". The seller is "5coreinc" and is located in Riverside, California. This item can't be shipped, the buyer must pick up the item.