The 3M Electrical Spec HDBB-310-1-250 is a high-quality heat shrink tubing made from durable polyolefin material. This tubing has a 3:1 shrink ratio, making it easy to use and suitable for a wide range of electrical applications. With a 1-inch diameter and a length of 250 feet, this product is ideal for providing insulation and protection for wires and cables. The black color adds a professional finish to any project, while the heat-activated adhesive lining ensures a secure and long-lasting seal. Trust 3M Electrical Spec HDBB-310-1-250 for your electrical insulation needs.