For high-quality versions like XTR, Dura-Ace, Ultegra, and 105, the inner cable is coated with PTFE (Teflon) to minimize friction losses and ensure smooth shifting. Shimano Original Parts maintain the precision and functionality of the components for optimal performance, maximum safety, and long durability. The quality of Shimano Original Parts is convincing. Each part is extensively tested and inspected. Shimano's internal requirements are often higher than industry standards and norms, which ensures safety and reliability. The segmentation into groups clearly categorizes performance according to the top-down principle, thereby distinctly defining each Shimano performance level. Only Shimano Original Parts fit perfectly with Shimano components.