Shimano Gear Outer Cable. It has been designed to reduce friction of the inner cable.
Shimano OT-SP41 Gear Cable Housing Sheath Outer 3 metres 3000mm Black Genuine
Shimano OT-SP41 Gear Cable Housing Sheath Outer 6 metres 6000mm Black Genuine
Shimano OT-SP41 Gear Cable Housing Sheath Outer 2 metres 2000mm Black Genuine
Shimano OT-SP41 Gear Cable Shift Housing - New Per Metre
Shimano OT-SP41 Gear Cable Housing Sheath Outer 5 metres 5000mm Black Genuine
Shimano OT-SP41 Gear Cable Housing, Sheath, Outer 1880mm - White