Creates a tight, waterproof seal to block water, oil, salt, dirt, and sunlight. Includes a wide variety of tubing sizes and colors. Offers shrink-fit protection and strain relief of wires, solder joints, terminals, and connections. Includes a convenient divided container to keep the pieces organized and easily portable. 2:1 Shrink Ratio (shrinks to ½ of its original Diameter). Voltage rating: 600V. Temperature Operating Range: -52° F To 257° F. UL Listed.