Their end caps are identical to OE and are designed to "click" into place for easy installation and a secure fit. An installer can feel and hear that a solid connection has been made, even in a difficult-to-see location. Through a patented process, the terminals are attached with an extremely strong connection ensuring the cable and boot will not separate during removal and installation. Each wire in the set is pre-cut to exact length so the wire sets are ready to install right out of the box.Denso 7 and 8mm ignition wire sets are SAE J2031 Class E rated, the highest quality wire used in the industry. These wires can withstand temperatures from -40 to 428 degrees F and pass tests covering everything from electrical properties, to shrinkage, to chemical resistance, and accelerated life testing.Features and benefits of Denso Ignition Wire Sets include:. High-temperature silicone jacket to withstand heat, cold, chemicals, and moisture. Reinforcing member for added strength and terminal retention. Silicone insulation for superior dielectric and heat performance. Conductive silicon layer on 7 and 8mm wires for high-temperature performance and EMI/RFI noise suppression. Fiberglass braid for maximum strength on 7 and 8mm wires. Carbon-impregnated fiberglass core for superior conductivity on 7 and 8mm wires. Core reinforced with KEVLAR on smaller diameter wires. Conductive layer impregnated with Ferrite on smaller diameter wires. Wire-wound layer on smaller diameter wires to suppress EMI/RFI noise. Superior dielectric and thermal qualities.