The Vertex Marine Thick Adhesive Lined Heat Shrink is a set of six 3/4" diameter, 6" length heat shrink tubes designed for marine audio applications. The black tubes are lined with adhesive for easy installation and a secure fit. Manufactured by Vertex, these heat shrink tubes provide a reliable and waterproof seal for your marine electronics. Ideal for use in boats, kayaks, or other watercraft, this product ensures your audio equipment stays protected and functional in various marine environments.