CNC-machined from long-wearing 7075-T6 aluminum alloy Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Alloy cogs are anodized black with laser-etched graphics 16T x 3/32` 16T Black 14gUPC/EAN/GTIN: 639266092391