Shimano SS-7600 Dura-Ace track cogs are CNC machined hardened chromoly.

• Shimano Dura Ace Track Lock Ring (Black)
• Park Tool Head-Gear Lockring Wrench
• SRAM 2013 Omnium Track Bicycle Crankset w/GXP Cups
• B00E5LEPII
• Shimano Dura Ace Cog 16 Teeth Track (Grey)