SPECIFICATIONSBrand Name: NONEChoice: yesHigh-concerned chemical: noneOrigin: Mainland China Product Description: HIGH - QUALITY MATERIAL: Made of plastic and tin alloy, these automotive repair shielded solder - free waterproof heat - shrink wire terminals are durable and corrosion - resistant. The plastic provides good insulation, while the tin alloy ensures excellent electrical conductivity. WIDE TEMPERATURE RANGE: With a working temperature ranging from - 55°C to 125°C, they can operate reliably in various harsh environments. The shrink temperature is 80°C, and the solder starts to dissolve at 138°C and fully dissolves at 160°C, ensuring a secure connection. EASY TO USE: No soldering is required. Just insert the wires into the terminal, then use a heat gun to heat it. The terminal will shrink tightly around the wires, creating a waterproof and insulated connection in a short time. GOOD INSULATION PERFORMANCE: Boasting a dielectric strength of 1KV, these terminals effectively prevent electrical leakage, enhancing the safety of the electrical system in your vehicle. Product Details: Material: Plastic + Tin Alloy Operating Temperature: -55°C to 125°C Shrink Temperature: 80°C Solder Melting Point: Starts at 138°C, Fully Melts at 160°C Dielectric Strength: 1KV Dimensions:Red: Inner Diameter 2.7mm, Length 40mm; Blue: Inner Diameter 4.5mm, Length 40mm Package Includes: 10-100 * Heat-Shrink Wire Terminals