CNC'd on a 5-axis CNC machine from solid bar stock Titanium.Designed and manufactured in San Diego, California.Q FACTOR: 168mm (Boost Spindle) / 177mm (SB Spindle) / 183mm (DH Spindle)Chainring: 8 Bolt SRAM InterfaceMaterial: Ti-6Al-4VCrank Bolts: AL7075Hardware: Self-ExtractingPreloader: AL6061Weight: 553g (Boost Spindle) / 564g (SB Spindle) / 583g (DH Spindle)