Moroso Ultra-40 Blue 7mm Leade Set (MO73537)ULTRA 40 7MM SLEEVED LEADS LS1 Suit GM LS Series 9. 75" Lead Length Part Number: MO73537 Exterior sleeving offers improved dielectric strength for added resistance to outside pulses while electrical protecting wire against heat, chafing and contaminants 8. 65mmdiameter wire with 40 ohms of resistance per foot Sleeving adds extra dielectric strength which is wires ability tonot be affected by outside electrical pulses Sleeving extends spark plug wire