Spark Plug Wire Set is pre-cut to exact length so the wire sets are ready to install right out of the box. End caps are designed to "click" into place for easy installation and a secure fit. This allows the installer to "feel and hear" that a solid connection has been made, even when the connection is in a difficult-to-see location. 1.Carbon impregnated fiberglass core for superior support conductivity. 2.Fiberglass braid for maximum strength. 3.Conductive silicon layer for high temperature performance and EMI/RFI noise suppression. 4.Silicone insulation for superior dielectric and heat performance. 5.Reinforcing member for added strength and terminal retention. 6.High temperature "class E" silicone jacket to withstand heat, cold, chemicals, and moisture. 7.Core reinforced with Kevlar. 8.Layer impregnated with Ferrite. 9.Wire wound layer to suppress EMI/RFI noise.