KMC hairpin EPT, maximum corrosion protection e1EPT / X8EPT / X8 / Z7 / Z6 / Shimano UG51 / HG40 / 50 / 70 / 90 Size: 1/2 X 3/32 EPT Rust protection redefined. KMC's non-toxic and environmentally friendly EcoProTeQ Technology (EPT) provides chains with corrosion protection (first signs of rust appear after 650 hours of salt spray testing), doubling the durability of conventional rust protection and setting new standards. EcoProTeQ EPT non-toxic, environmentally friendly 100% coating: each cell element is treated separately first traces of rust only after 650 hours of salt spray testing (twice as long as conventional rust protection) smooth surface ensuring excellent driving properties minimized dirt accumulation, which reduces maintenance costs.