SPEC flywheels are CNC manufactured at an unheard-of .001 tolerance, in an industry where the standard is .010. This precision manufacturing process ensures perfect balance and a perfectly flat bedding surface for the clutch disc, both of which also contribute to the ultimate in safety for competitive environments. All SPEC flywheels carry SFI certification Benefits: SPEC flywheels are CNC manufactured at an unheard-of .001 tolerance, in an industry where the standard is .010. This precision manufacturing process ensures perfect balance and a perfectly flat bedding surface for the clutch disc, both of which also contribute to the ultimate in safety for competitive environments. All SPEC flywheels carry SFI certification. Shipping: This item is shipped directly from the the manufacturer 5-14 days to ship to your location. ------------------------------------------------------------ THIS ITEM CAN NOT BE RETURNED UNLESS THERE IS VERIFICATION BY THE SPEC TECH (HELP) LINE. IF THERE IS ANY PROBLEM DURING INSTALLATION CALL THE TECH LINE FOR ASSISTANCE