Choose our quality products and enjoy your wonderful life,It's our pleasure to serve you. Product Item: 120 Pcs O Ring Type Heat Shrink terminals, 22-16 16-14 12-10 AWG, Electrical, Solderless Wire Connectors Kit Product package include:RED22-16 AWG x 40 pcs BLUE14-12 AWG x 40 pcs YELLOW12-10 AWG x 40 pcs material: Pure copper Insulator material: PVC Color:Yellow, Red Total piece:120 piece Features Wire Range:22-16 AWG (0.5-1.5mm²), 16-14 AWG (1.5-2.5 mm²),12-10 AWG (4-6mm²) Good insulation and conductivity,anti-oxidation,anti-corrosion, and it plays a good role in protecting the circuit and can be used for a long time. Shrinkage ratio 3:1 Operating temperature: -55 Degree C -125 Degree C Minimum shrink temperature : 80°C. Fully recovery temperature : 130°C If not satisfied, can return it for a refund in 30 days, can also send an email to suggest improvements, we just hope you have a better shopping experience assured to use. How to use? Step 1 Strip wire insulation Step 2 Crimp terminal barrel with a wire crimper Step 3 apply heat with a heat gun while rotating a connector The products are placed in a transparent box. When you use up these products, the remaining box can be used as a tool box for your storage Supporting Services We not only provide you with quality products, but also provide you with better after-s services. If you have any concerns, please feel free to contact us, thank you.