Original Engine Management PD3900 Coil on Plug Boot Coil Boots are precisely designed and manufactured to meet O.E. fit, form, and function, ensuring extended durability and avoiding premature failure. Ready for Install Straight out of the box Excellent quality & materials. High-temperature pure silicone outer jackets for protection Silicone plug & coil boots for superior dielectric strength Nickel-plated steel terminals for maximum strength & conductivity