I have copies of the RKII's on my car and they look awesome, I've been thinking of getting the real BBS RK's for it though as the RKII copies were on the car when I bought it and they are kinda heavy, I think about 8 lbs heavier each. I believe the BBS' are in fact cast, according to Bekkers (check link bekkers/BBS RK), not sure what semi-forged is. Good Luck, Keep us informed, rdh2002