These ACCEL wire sets are a true performance upgrade replacement for OE types. Efficient delivery of spark energy for a good price. Silicone boots with blue, black, red and yellow wire, zinc-plated steel terminals. Tinned copper core. Product Features:Graphite Suppression Eliminates RFI/EMI3000 To 7000 Ohms Per Foot Of ResistanceSilicone Spark Plug Boots450 Degree Temperature RatingMeets Or Exceeds OE Boot Temperature Rating