BOX COMPONENTS Pinion 3/32" CNC 16T Aluminum 7075 Cog, Black NC-machined 7075-t6 aluminum alloy orconk-machined Chromoly Alloy cogs are anodized Black with laser-etched graphics, while Chromoly cogs are electro plated Black with laser-etched logos Both have a 5mm wide inner base, giving more solid interface with cassette body