Minimum soldering temperature for melting: 138°C Minimum shrinking temperature: 80°C Operating temperature: -55 ℃ - 125 ℃ Diameter of electrical wires: White: 0.25-0.34 ² mm - 20 pcs Red: 0.5-1.0 ² mm - 40 pcs Blue: 1.4 -2.5 ² mm - 30 pcs Yellow: 4.0-6.0 ² mm - 10 pcs Size of heat shrink connectors: Red: diameter 3.0 mm Blue: diameter 5.0 mm White: diameter 1.5 mm Yellow: diameter 6.0 mm