Shimano Polymer Coated Brake Cable Set - Heather Gray Low friction polymer material on the cable may cause slippage at the cable fixing bolt after initial pre-stretch for the cable is performed. Fur like material from polymer coating will not a Dura-Ace grade SLR-EV Road brake cable set Polymer-coated inner cable reduces the sliding resistance to achieve lighter and quicker operation Pre-lubed with special polymer compatible grease Stainless steel for anti-rust protection