Upgrade your cycling gear with the Shimano SIS-SP41 Derail Casing, designed to enhance your biking performance. This high-quality casing comes in a sleek black color and a cable diameter of 4mm, ensuring durability and smooth operation.

The package includes a 50M box of pre-lubricated casing with special silicon grease that effectively reduces cable friction, providing you with a seamless riding experience. The black housing not only adds a stylish touch to your bike but also ensures longevity and resistance to wear and tear.

With the Shimano SIS-SP41 Derail Casing, you can trust in its reliability and performance, making it a must-have for any cycling enthusiast. Upgrade your gear today and enjoy the benefits of smooth cable operation and enhanced biking efficiency.