About this item THREE DIFFERENT SIZES – There are 3 different sizes of freehub spacers in the pack, 1mm 1.5mm 2mm thickness, convenient for you to choose the appropriate thickness according to your actual requirements. The freehub spacers are lightweight and portable, easy to carry. GOOD PERFORMANCE – The bike headset washers are perfect for adjusting your bike bottom bracket, flywheel or hub,Protruding parts exactness machined to exact tolerance for decrease vibration in rotation. Easy to install, no complicated operations are required. DURABLE IN USE – The bike headset spacer is made of -quality aluminum alloy material, strong, sturdy and durable in use. With a long service life, no need to replace frequently, and you will have a better cycling experience. WIDE APPLICATION – These bike cassette spacers are widely used for mountain bikes and road bikes. Replace old or broken gaskets in time can increase the life of the bike. These spacers are good accessories for bottom bracket, flywheel or wheel hub adjusting. SATISFACTION GUARANTEE – This product has a precise tolerance, which can reduce shaking during rotation and defend other parts. If you are not satisfied with our product received, you can contact us anytime, we will reply you within 24h.