1.MATERIALS: Forged aluminum alloy material, Sturdy, corrosion-resistant, rust-free, high toughness, no deformation, durable for more safety when use.2.FUNCTIONAL GASKETS: The bicycle neck extender is equipped with 5 washers, each of which is 10mm and the height is increased to 100mm.3.ADJUSTABLE: The height of the extender can be adjusted by adjusting the number and type of spacers, reducing the pressure of waist effectively, biking more relaxed. Take the discomfort away from your upper back, neck and wrist.4.EASY INSTALLATION & WIDELY COMPATIBLE: Just connect the original front fork to complete the installation. Our bicycle Fork Stem Extenders are suitable for most 1-1/8''(28.6mm) threadless steerer mountain bikes, road bikes MTB bike and more.5.Adjustable Height : You can freely adjust the stem riser to fit your own height, that will make your riding more comfortable.