Enkei EDR9 17x7 4x100/108 38mm Offset 72.6 Bore Diameter Black Wheel - 441-770-1138BKEDR9 9 Spoke Design Sizes 15, 16, 17 & 18 Inch In Matte Black & Silver Spec E Inspected SPEC E All Enkei wheels are engineered to pass rigorous testing. In fact, Enkei established its own test standard called Spec E, which is tougher than JWL requirements. Enkeis Spec E test setting requires a higher drop point in the impact test and 20% more cycles for the rotary bending fatigue and dynamic radial fatigue tests than JWL standards. The Spec E