The RNF-100-3/4-6-STK with Heat Shrink Tubing and Sleeves 3/4" is a product manufactured by TE Connectivity. It is a shrinkable tubing made of flexible plastic with a heat-shrinkable coating for use in applications such as electrical insulation, environmental sealing, strain relief, and protection from mechanical damage. The tubing comes in blue and is sold by the foot, making it easy to order the exact length needed for a particular application. The RNF-100-3/4-6-STK has a thin wall that allows for the tubing to expand over and fit different wire sizes. The heat-shrinkable coating also provides protection from abrasions, moisture, chemicals, and other environmental elements. The product has a rating of USB to +200°C, allowing for more robust performance in extreme environments. TE Connectivity is a global leader in the design, manufacture, and supply of connector components, backplane components, and related products.