Not quite forged, but flow-formed by the Japanese (they call it "Advanced Metal Forming") so almost as strong and light (similar to spun-rim / rim rolling process used by Forgestar and BBS)
(Genuine), Made in Japan
Size: 19" x 8.0" and 19" x 9.0"
Bolt Pattern: 5x120
Material: 1-piece Advanced Metal Forming
Weight: 19.6lb and 20.9lb
for the set of 4
My wheels are brand new, sealed in boxes. These are borrowed photos (more interesting than cardboard boxes, I suppose). The fit is perfect for the Z4!