3: 1-SHRINK RATIO - Shrink to 1/3 its original diameter, the glue inside is super powerful and melts easily, forming a waterproof seal that really holds the wires together. Note: The size of the display is the pre-shrink size and the diameter of the heat-shrinkable tube when it is circular. EASY TO CUT - Tired of always buying a small package of different sizes and never having enough of one size Our heat shrink tubing kit is the best solution for you. Our shrink tubing kit is different from the same 45mm / 40mm length on the market and can be 18cm (7.1 inches) each. It can be cut to any size as required. MULTIPLE HANDSIZE - Several large shrink tubes of your choice. The package contains: 20 pieces of black shrink tubing, tube length / piece: 18 cm (7.1 ). 8 sizes, DIA: 38 mm (1.5 ) 2 pcs, 32 mm (1.25) 2 pcs, 25 mm (1 ) 2 pcs, 19 mm (3/4) 3 pcs, 12 mm (1/2 ) 3 pieces, 9 mm (3/8 ) 2 pieces, 6 mm (1/4) 3 pieces, 3mm (1/8 ) 3 pieces. PREMIUM QUALITT - shrink tubing made of high quality polyolefin material offers the advantages of good electrical insulation, high toughness, good tightness and corrosion resistance, high temperature resistance, fairly thick, not easy to break and long service life. EASY APPLICATION - When heat is applied, glue will leak and seal the joint, creating waterproof and long lasting insulation. Simply slide the heat shrink tubing over your connection point and apply heat. Use only a medicinal air gun that is made in seconds.