BBS RG-R 712H - 17x7 4x100 ET38 Diamond Silver Wheel -70mm PFS/Clip RequiredFORGED LINE DIE FORGED SERIES When the goal is ultimate performance, a forged wheel from BBS is the answer BBS has been offering forged aluminum wheels in the aftermarket since 1983. Our special multi stage Die Forging process help us create the strongest and most durable wheels possible. Starting from a billet of 6000 series or even a special 7000 series Dura aluminum, these aircraft quality alloys are forged with up to 18 million pounds of pressure.