X Series - One chain for all. Choose the corresponding speed and KMC handles the rest. 100% Compatibility on all leading derailleur systems. Asymmetrical chamfering for outer plates ingeniously avoids interference between chain and cassette teeth to guarantee quiet and safe performance. Compatible with both single and multiple chainrings. Precision manufacturing techniques deliver phenomenal shifting performance and easier drivetrain adjustment and stability.
 
Features
Hi-Performance.
Double X Bridge Shape for fast and smooth shifting.
Mushroomed Riveting.
Inner and Outer Plate Chamfering for smooth operation.
Non-Directional.
Extra Stretch Proof Pins.
Strongest chain connection in the industry today.
Nickel Plated. 
126 links.