They are plain old forged cranks - think omnium like in construction that happen to fit the Si hollowgram axle.
For some reason I kept calling it a Hollowgram cause it a branding.
Still at 540g without axles, it's pretty light, lighter than Ultegra even with the axles.
@edscoble started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
They are plain old forged cranks - think omnium like in construction that happen to fit the Si hollowgram axle.