Features: 1.Includes pink (AWG 22-16), blue (AWG 16-14) , yellow (AWG 12?10) butt connectors , which can be used for wires AWG from 22 to 10. 2.The thick copper barrel ensures firm crimping, with minimal voltage drop, high current flow, and less heat, and the short circuit and wiring problems are prevented. 3.Each terminal comes with a tin?plated thick copper barrel to prevent corrosion, thereby fixing it during crimping. The barrel is made of a seamless piece of copper, eliminating the problem of barrel openings and ensuring that the wires will never slip out of the connector. 4.The insulating tube has a unique double?wall design. The high?quality 3:1 shrink tube has a heat?activated sealant lining to provide a 360?degree tight seal. Flame retardant, waterproof, can be used underground. 5.It meets all electrical standards and ensures a strong watertight seals to ensure everything is properly glued, suitable for ships, automotive applications, homes and scientific research projects, etc. Specification: Item Type: Heat Shrink Butt Connectors Material: Rubber + Aluminum Alloy Quantity: Pink(AWG 22 16): 90pcs Blue(AWG 16 14): 90pcs Yellow(AWG 12 10): 20pcs Thickness: Pink: Approx. 0.7mm/0.03in Blue: Approx. 0.8mm/0.03in Yellow: Approx. 1mm/0.04in PackageList: 90 x Pink Heat Shrink Butt Connectors 90 x Blue Heat Shrink Butt Connectors 20 x Yellow Heat Shrink Butt Connectors