Premium nylon insulation won't split or crack like automotive grade vinyl (PVC) insulation and resists water, oil, chemicals, acids and ultra-violet rays. Manufactured from the highest-grade tin plated electrolytic copper, which provides greater corrosion resistance, and better conductivity, which equals less power loss. Tinned brass funnel entry sleeve provides secondary crimp location onto jacket of wire for added strain relief from vibration and flexing, also prevents strands from splitting or cracking during insertion of wire Color-coded nylon insulation for safety and ease of identification.