Ah okay... after little research, the 2 piece Kics lug nut's body is made of cold forged SCM-435 which is alloy steel while the taper seat is made of A7075-T6 aluminum and ultra-hard aluminite finish. 
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09 PW 370z Nismo | K&N Drop Ins | HKS Hi Power | Berk HFCs | Work Meister S1 3P | Project Kics R40 Neo Chrome Lug Nuts | KW V1 | SPC rear camber arms/toe bolts | Southbend Stage 3 daily clutch | Southband 19Ib Steel Flywheel | ZSpeed CSC
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