Spark Plug Wire Set-Base MSD 31199spark plug boot material : Silicone and Synthetic number of wires : 8 distributor boot color : Gray wire resistance : 40 To 50 Ohms Per Foot Resistance includes coil wire : Yes manufacturer part number : 31199 assembled : No distributor terminal ends : HEI product shipping template : Migrated Template brand : MSD Ignition diameter (mm) : 8.5 Millimeter wire material : Silicone and Synthetic distributor boot material : Silicone and Synthetic conductor type : Copper Alloy With Ferro Magnetic Impregnated Center Core manufacturer warranty : Manufacturer's Warranty rfi suppression : Yes upc : 085132311996 california prop 65 warning : This product can expose you to chemicals which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov mpn : 31199 spark plug boot color : Gray spark plug boot ends : Straight