Features1Aluminum Alloy Material: The bike crankset dust cover is made of durable and erosion resistant aluminum alloy, providing long lasting performance and a extended lifespan. 2Lightweight and Thin Design: The bike crankset dust cover has an ultra thin and lightweight design that does not add additional weight to your bike. 3CNC Precise Machining: The bike crankset dust cover undergoes precise CNC machining and anodization that provides anti erosion and anti wear properties, as well as a non fading finish. 4Includes Rubber Rings: The bike crankset dust cover set comes equipped with 18mm/0.7in and 20mm/0.8in rubber rings that make it compatible with most hollow cranksets, ensuring a fit. 5Stylish Black Appearance and Easy Installation: The bike crankset dust cover has a fashionable black appearance that is easy to install, making it an attractive and functional accessory for your bike.SpecificationItem Type: Bike Crankset Dust CoverMaterial: Aluminum alloyWeight: Approx. 7g/0.2ozColor: BlackPackage List1 xCrankset Dust Cover2 xRubberRing