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PROSTREET 250 Universal Wire Sets Are Designed For Both Street And Race Applications. Our 250 Ohm Wire Wound Core Starts Off With A Stranded Flexible Base And Is Then Coated With A Conductive Solution To Prevent Any Possible Conductivity Failures. Our Wire Is Manufactured Using The Best Available Silicone That Will Withstand Extreme Engine Heat And Conditions. Our Double Extruded Wire Features Inner Braiding That Offers Excellent Terminal Pull Of Strength. Stainless Steel And Brass Terminals Provide Excellent Conductivity While Offering The Lowest Possible Resistance To Maximize Performance. Terminals Are Crimped Using High Tonnage Presses To Ensure Perfect Application Tolerances Are Met. High Temperature Silicone And EPDM Boots Provide Excellent Heat And Oil Resistance While Also Providing High Dielectric Strength Which Meet Or Exceed SAE Specifications. PROSTREET 250 Universal And Custom Wire Sets Are Proudly Made In The USA. Our Spark Plug Wires Are Manufactured Using Precision Machinery By A Staff With Over 75 Combined Years In The Industry.