Mavic exclusive technology for Wheel-Tyre System featuring aluminum rims provides a very high level of durability and a unique aesthetic. The Exalith specific treatment penetrates the alloy, so the rim keeps its distinctive anthracite grey color for thousands of kilometers. - Delays rim wear - Specific formulation penetrates into the rim to provide extreme hardness - To be used with special Mavic Exalith brake pads to ensure braking performance and longevity (delivered with the wheels)