JINYU Bike Compatible Stem Extender, Bicycle Handlebar Riser Adaptor, Aluminium Alloy Head Up Adapter, Compatible With Mountain Bike, Road Bike, Mtb 1.MATERIALS: Forged aluminum alloy material, Sturdy, corrosion-resistant, rust-free, high toughness, no deformation, durable for more safety when use. 2.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.Adjustable Height : You can freely adjust the stem riser to fit your own height, that will make your riding more comfortable. color: red Size: length 12CM, width about 3.5CM, suitable for standard caliber 28.6mm, most mountain bikes/road bikes Delivery quantity: 1 piece (including the main body of the stem height increaser + 115mm threaded rod + 10mm washer*4+5mm washer*1+stem cover) Warm prompt: 1. As different measuring methods, it will occur 1-3 cm deviation about the items, please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products.