PREMIUM QUALITY: Thick brass in the wire connectors ensures strong secure crimping every time, providing small voltage drop, high current flow, and less heat. These will prevent short circuits and problematic wiring that inferior connectors are known    for DURABILITY: Each terminal in the electrical connectors kit features a thick tinned brass that resists corrosion to hold the wire tight when crimped. COLOR and SIZE The connector assortment includes red (AWG 22, AWG 21, AWG 20, AWG 19, AWG 18, AWG 17, AWG 16), blue (AWG 16, AWG 15, AWG 14) and yellow (AWG 12, AWG 11 , AWG 10) nylon spade connectors that can be used on wire AWG from 22 to 10. Red,    blue and yellow indicate different gauge size of electrical connectors for easy identification when using. WIDE APPLICATIONS: Compliant with all electrical standards, perfect for house and automobile applications, whether you are working on your vehicle, home or scientific project, our quick connector wire connectors will ensure sure everything bond correctly