Shimano Shifting Cable polymer coatedThe secret of Shimano polymer coated shift cables is a polymer coating that looks under the microscope like a series of tubes wrapped around the cable. This means less surface rubs against the inner case lining and the grease lasts longer. The main advantages are significantly less shifting effort and the feeling of a faster shifting process as well as improved braking performance with remarkably lower brake lever effort. OT-SP41 Outer CaseWith the OT-SP41, the outer case is pre-lubricated along the entire length with a special silicone lubricant to allow fast, precise shifts. The OT-SP41 lowers friction losses of the inner pull to an absolute minimum, so that the circuit responds quickly and is effortless to use. The driver is relieved by the elimination of shift delays and high effort when shifting, especially in a terrain that requires frequent switching or on the long distance.