Use to cover the bare wire part with these tubes, heating with a heat gun or even a hair dryer (hot enough), the tube shrinks and protects the wires with excellent electrical insulation performance. Assortment of heat-shrink tubing, 11 sizes and 6 colors. Shrink ratio: 2:1, Operating Temperature: -55C to +125C, flame retardant. Inner diameter: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 8mm, 10mm Assorted in a plastic case transparent plastic for easy transport and better organization. Color: Black, red, blue, yellow, green, transparent. Contents: 80 pieces x 1.0 x 38mm approx. Black. 80 pieces x 1.5 x 38 mm approx. Yellow. 50 pieces of 2.0 x 38 mm approx. Blue 50 pieces of 2.0 x 38 mm approx. Black. 30 pieces of 2.5 x 38 mm approximately. Black. 30 pieces of 3.0 x 38 mm approx. Green. 30 pieces of 3.0 x 38 mm approx. Transparent. 30 pieces of approximately 3.5 x 38 mm. Black. 40 pieces x 4.0 x 45 mm approx. Black. 30 pieces x 4.0 x 45 mm approx. red. 30 pieces of 5.0 x 45 mm approx. Black. 20 pieces of approximately 6 x 45 mm. Yellow. 20 pieces of approximately 8 x 45 mm. red. 20 pieces of approximately 10 x 45 mm. Blue 20 pieces of 10 x 45 mm approx. Black. 20 pieces of approximately 10 x 45 mm. Transparent. Characteristics: Minimum shrinkage temperature: + 84 . Full shrinkage temperature: +125 maximum. Operating temperature: -55 to + 125 . Dielectric resistance: 15 kV/mm Flammability: flame retardant. Cutting method: scissors or sharp knife. luckymeet