The ALPHA WIRE part F2211/8-BK103 is a high-quality heat shrink tubing designed for electrical insulation and strain relief applications. This package includes 25 tubes, each measuring 1/8" in diameter and 4ft in length, providing ample material for various projects. The tubing is made from superior quality polyolefin material with a 2:1 shrink ratio, allowing it to shrink tightly over the desired area when heated. Its black color provides a sleek finish and helps with identification and organization. Ideal for professional use or DIY projects, this FIT-221 heat shrink tubing ensures reliable and long-lasting protection for wires, cables, and other components.