This specialized, hybrid process utilizes a machine that spins an initial Pressure Cast blank, heats the outer portion, and then uses steel rollers to press against the rim area. Much like clay on a potters wheel, the rollers "pull" the casting to its final width and shape -- that of a rim. This special combination of heat, pressure, and spinning create a rim with similar strength and performance to that of a forged wheel, but at a more reasonable cost! It's our understanding that BBS pioneered this process and has used it for several years in their production of racing wheels for Formula One and Indy cars. OZ Racing employs a similar process (if not arguably identical) which they've termed High Light Technology (HLT). OZ's experience with Flow Forming is also derived from their extensive experience with Formula One and Indy. Similarly, Enkei has a rim forming process they refer to as the Most Advanced Technology (MAT), Rays has a process they call Rays Cast-Flow Forming (RCF), and even ultra high-end manufacturer HRE now offers a full product line of Flow Formed wheels.