Description: No Soldering or Crimping Required: These Solder Seals Wire Connectors can be easily installed with just a heat machine, making the connection process simple and efficient. Heat Shrinkable & Waterproof: The design includes a heat shrink feature that ensures a tight and contact, providing conductivity. It also offers waterproof protection to prevent any damage from moisture. High Temperature Resistance & Insulation: Made of quality material that is resistant to high temperatures and flame retardant, these solder sleeves provide insulation to prevent electrical leakage, ensuring usage. Separation Barrier: Each heat shrink rings terminal features an internal separation barrier in the middle, ensuring that the copper wires inserted from both ends are of equal length for optimal performance. Package Contents: The package includes 50/100pcs - offering you a variety of options for different wiring needs. Size Chart: 50pcs:White 10pcs Red 23pcs Blue 12pcs Yellow 5pcs 100pcs:White 25pcs Red 35pcs Blue 30pcs Yellow 10pcs Package Includes: 50pcs Solder Seals Wire Connectors or 100pcs Solder Seals Wire Connectors Note: Please allow slightly errors due to manual measurement and different monitors.