Features: 1.Qualified solder seal heat shrink wire connectors, which can fully meet your needs in various wiring projects. 2.The melted solder ensures that the wires are firmly connected and prevent the wires from slipping out of the terminals. 3.Made of premium quality plastic, this terminals have excellent sealing, strain relief, cable check and insulation properties. 4.Features 2:1 shrinkage ratio, ?55 ?125 operating temperature, 80 minimum shrink temperature and 138C lowest solder melting temperature. 5.Can be used in ships, vehicles and home, brings firm welding, increased current and weatherproof connection. Specification: Item Type: Solder Sleeve_x000D_ Material: Plastic_x000D_ Quantity: 1 Box (250pcs)_x000D_ Solder Sleeve White SST-S11(40PCS)_x000D_ Solder Sleeve Red SST-S21(100PCS)_x000D_ Solder Sleeve Blue SST-S31(90PCS)_x000D_ Solder Sleeve Yellow SST-S41(20PCS)_x000D_ Size:_x000D_ Red connector: Approx. 2.7mm/0.11in in diameter, cable cross-section 0.5 to 1.0mm2_x000D_ Blue connector: Approx. 4.5mm/0.18in in diameter, cable cross-section 1.5-2.5mm2_x000D_ White connector: Approx. 1.7mm/0.07in in diameter, cable cross-section 0.25-0.34mm2_x000D_ Yellow connector: Approx. 6.0mm/0.24in in diameter, cable cross-section 4.0-6.0mm2_x000D_ _x000D_ _x000D_ Operating Temperature: -55 to 125 (-67F to 256F)_x000D_ Minimum Shrink Temperature: 80 (176F)_x000D_ Lowest Temperature of Solder Melting: 138C (280.4F)_x000D_ Shrinkage Ratio: 2:1_x000D_ Temperature that Start to Shrink: 80_x000D_ Temperature that Solder Ring start to Melt: 111_x000D_ Temperature that Solder Ring Melt Completely: 138_x000D_ _x000D_ Application: Whether you are working on your boat, vehicle, home or scientific project, our heat shrink solder and seal connectors will ensure solid soldering, increased current flow and weatherproof connections every time. PackageList: 1 Box of Solder Sleeves (250pcs)