15T

 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 15T Black 13g

 CNC-machined chromoly construction Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Electro plated black with laser-etched logos 15T Black 13g

 Splined, hardened chromoly construction Optimized for strength and durability Designed for Shimano/Sram style cassette bodies ZERO-FLEX taper base design Strongest single speed cog on the market 15Tx3/32` Silver

 Threaded, hardened chromoly design Ultra strong Coated to withstand rusting 1.37` x 24 tpi 15Tx1/8` Silver

 Threaded, hardened chromoly design Ultra strong Coated to withstand rusting 1.37` x 24 tpi 15Tx3/32` Silver