KMC Z8.1.  8 Speed Chain. 

• Compatible with all 6-, 7- and 8-speed systems
• EPT, maximum anti rust protection
• Includes a MissingLink

EcoProTeQ technology EPT from KMC protects chains against corrosion for twice as long as conventional rust protection and thus sets new standards. Each component of every chain link is treated separately with EPT. This means a 100 % coating that offers the lowest possible attack by water, salt and air humidity.