We took the standard cassette & turned it inside out! There are times when the simplest solution is the best one In the case of the new OG 1090 Cassette&44; simplicity also means elegance&44; efficiency&44; & performance We took up the challenge of re-engineering the cassette from a component made up of many parts down to strippeddown but exceptionally strong set of cogs that stick firmly to SRAM Reds core principles of light weight&44; higher efficiency&44; & maximized technologies The main cogset of the OG 1090 cassette is machined out of a single forged form that is heat treated & then shaped in a complex series of CNC-guided operations never before seen in this type of application This is truly a revolutionary design that will take you by surprise with its ingenious simplicity The sprockets themselves (including two free cogs) have all been designed with SRAMs proprietary Open Glide™ design for smooth-as-silk up- & downshifts Weight&44; stiffness&44; & strength-wise&44; the radical OG 1090 Cassette delivers titaniums desireable weight&44; with solid steels superior strength & stiffness