[3:1 SHRINK RATIO & FAST CONTRACTION SPEED] Shrinks to 1/3 of its old diameter and seals extremely tightly, solving the problem of many 2:1 shrink tubes that don't shrink enough and therefore don't seal tightly enough. Shrink temperature: 80 to 125°C. Provides a professional connection within seconds. [INCLUDES ADHESIVE COATING] When the heat shrink tubing is heated, it automatically releases adhesive and seals the connection extremely reliably. This creates a waterproof and insulation with a satisfaction . [DUAL WALL TUBING] The outer wall of the shrink tube provides extremely high abrasion resistance. The inner wall creates a consistently waterproof seal and excellent strain relief. Our solder connectors also impress you! [7 SIZES] We offer 7 of the most commonly used shrink tube diameters in the world, ranging from 3/32inch to 3/4inch. All of our shrink tubes are pre-cut to 1.75 inches. [VERSATILE APPLICATIONS] The waterproof shrink tubing can be used in marine and automotive wiring, model building, and DIY electrical wiring projects. The application areas are very diverse, such as electrical insulation/environmental sealing to protect against moisture, fuel and chemicals/protection of surfaces against abrasion, peeling and denting. Heat shrink ratio:3:1 Operating Temperature:-131°C to + 257℉ Shrinkage Temp:212℉(Fahrenheit) Full Shrinkage Temp:230℉maximum Tensile strength:10.4Mpa Dielectric strength:15 kV / mm :Flame Retardant Note:The plastic box looks random,Does not affect the use, does not accept the designation Colour:Black Material:polyolefin Package Contents: 1 * Heat Shrink Tubing Kit (400 PCS) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.