Features [Safe and easy to use] Solder sealed wire connectors do not need to be crimped, just place the stripped wire into the solder sleeve and heat it evenly to complete the connection [Waterproof, Insulation, No Corrosion] Polyolefin hose outside, hot melt adhesive and solder inside), double wall design ensure perfect insulation and waterproof performance, prevent wire corrosion even in humid environment [Solid and non-slip lines] The hot melt properties of the inner solder ensure strong tensile strength and tear resistance. The solder melts to keep the wires secure and never slips out of the plug when heated Transparent sleeve, sufficient quantity: A total of 200 solder shrink connectors (50 white, 70 red, 60 blue and 20 yellow). Specific colors for specific sizes, clear sleeves allow for accurate visual inspection during the connection process. shrink bags [Safe and Portable] Solder wire connectors are best suited for your boat, vehicle, plane, home and even scientific projects and ensure safe and weatherproof soldering. Comes with a protective case with compartments for easy storage and portable use Specification: Item Type: Solder Wire Connector Model: HX030454. Material: Outer: polyolefin tubing, interior: hot melt adhesive and solder. Shrink Ratio: 2:1 Parameters: SpecificationUsable wireUsable wireSize (approx.) Size (approx.) Size (approx.) Size (approx.) Size (approx.) Quantity (pcs.) Colour A.W.G mm² A L B and C C 200Yellow 12-10 4-66.0 mm/0.24 inches 40 mm/1.57 in3.7mm/0.15in6.0mm/0.24in3.4mm/0.13in 20White 26-24 0.25-0341 .7mm/0.7mm/07in26mm/1.02in1.0mm/0.04in1.7mm/0.07in0.76mm/0.03in 50Blue 16-14 1.5 -2.54.5mm/0.18in40mm/1.57in2.3mm/0.09in4.5mm/0.18in2.00.08 In 60Red 22-18 0.5-1.52.7mm/0.11in40mm/1.57in1.4mm/0.06in2.7mm/0.11in1 0.2mm/0.05 inch 70 Package list: 200 x solder wire connectors. 1 x storage box. Package List 200 x Solder Seal Wire Connectors 1 x Storage Box