The Shimano Road Optislick Gear Cable Set is a complete cable kit for Shimano 105 5800 and Tiagra 4700 gears. It uses coated stainless steel inner wires and low-friction SP41 outer casing for smooth, precise gear changes. The set includes the cables and fittings needed for a full gear cable replacement.Key Features and Benefits:OPTISLICK Inner Wires: An electrical coating creates a smooth surface on the stainless steel wires, which reduces friction and sliding resistance for lighter, smoother gear changes.SP41 Outer Casing: Low-friction silicone grease runs through the full length of the housing to reduce cable drag, helping each gear change feel smooth and consistent.Stiff Casing Construction: The SP41 housing uses a special directional winding process to resist compression, which helps transfer shifter movement to the derailleur quickly and with greater accuracy.Polymer-Lined Housing: A smooth polymer sheath lines the inside of the outer casing to help the inner wire move with less resistance, supporting precise and reliable shifting.Complete Cable Set: Includes two 1.2mm OPTISLICK inner wires, each 2100mm long, 1700mm of SP41 outer casing and all end caps, giving you the parts needed for a full gear cable replacement.Shimano Road Compatibility: Designed for Shimano 105 5800 and Tiagra 4700 gear systems, providing a suitable cable setup for smooth operation and accurate gear changes.Worn or dirty gear cables can cause slow shifts and poor gear response. Replacing both the inner wires and outer casing helps remove sources of friction throughout the cable system. This gives you a clean starting point for gear adjustment and helps maintain smooth shifting over time.The Shimano Road Optislick Gear Cable Set provides a practical way to refresh your road bike's gear cables. With low-friction components and all the key fittings in one pack, it offers a complete solution for restoring smooth and accurate shifting.