Designed for mountain and road bikes, this cassette spacer set ensures precise alignment and smooth operation of your bike's flywheel system. Crafted with durable materials, these spacers provide reliable performance and help optimize gear shifting. Their sleek design seamlessly integrates with your bike's cassette for enhanced functionality. Features -Color:Black -Material:Aluminium alloy -Size:3.50X3.50X1.00cm/1.38X1.38X0.39in -Thickness: 1mm, 1.5mm ,2mm ,1.85mm ,2.18mm ,2.35mm -Precision engineering cassette spacers: crafted with precision to ensure seamless compatibility with your bike's cassette, enhancing riding efficiency and gear performance -Adjustable spacer design cassette spacers: features a micro adjustment spacer design that allows easy tuning of gear spacing for smoother and more reliable shifting -Wide compatibility cassette spacers: designed to fit various mountain and road bikes, providing strong compatibility and effortless installation for all cycling enthusiasts -Durable aluminum alloy: made from aluminum alloy, providing excellent wear resistance and extended lifespan, reducing maintenance needs -Enhanced riding experience: optimized for both daily commuting and outdoor adventures, delivering a reliable and enjoyable cycling experience Package list: 6 x Bicycle flywheel washer