[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 125C. 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 durable insulation with a satisfaction guarantee.[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 will 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:3:1Operating Temperature:-131C to + 257Shrinkage Temp:212(Fahrenheit)Full Shrinkage Temp:230maximumTensile strength:10.4MpaDielectric strength:15 kV / mmFlammability:Flame RetardantNote:The plastic box looks random,Does not affect the use, does not accept the designationColour:BlackMaterial: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 er