Features: Heat shrink tubing is made from durable PE material, which has good heat resistance, corrosion resistance, and insulation performances. 2:1 shrink ratio: heat shrink tubes have only half of their original diameter after heating, so they fit snugly and securely to wires and cable, prevent moisture from entering, dust and other impurities and extend life of electronic devices. Easy to use: simply slide the heat shrink tube over the cable, heating it with a hair dryer or lighter, and it shrinks to the desired size in seconds. Widely used: Suitable for electrical insulation, cable bonding, and repairing wires, cable, pipes and electrical and electronic component and more. The set includes 12 different sizes of pipes (1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 10mm, 13mm), which can meet various wire insulation and protections needs. Specifications: Medium:PE Length: Approx. 45mm/1.77inch Inner Diameter: 1mm,1.5mm,2mm,2.5mm,3mm,3.5mm,4mm,5mm,6mm,7mm,10mm,13mm Box size: Approx. 19.7x13.2x3.6cm/7.75x5.20x1.42inch Package Includes: 180pcs 1mm 150pcs 1.5mm 100pcs 2mm 70pcs 2.5mm 60pcs 3mm 50pcs 3.5mm 45pcs 4mm 32pcs 5mm 25pcs 6mm 30pcs 7mm 30pcs 10mm 30pcs 13mm note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.