1 1/8" ID (before shrink) black heavy duty adhesive-lined shrink tubing. 1 ft. piece. Made of polyolefin. Has 3 to 1 shrink ratio. Use this heavy wall shrink tubing in the harshest of applications, including direct burial, submersible, corrosive, severe mechanical, and high voltage jobs. Adhesive lining allows the shrink tubing to attach itself to the wire or terminal it is encapsulating giving it a watertight seal. The high shrink ratio (3 to 1) enables easy bridging and encapsulation of odd shaped connectors or applications. Polyolefin is the standard-bearer in the shrink tubing market. It heats evenly, doesn't bubble or split, and is self-extinguishing. It also offers greater flexibility than PVC shrink tubing. Install with a butane torch or heat gun.