Upgraded Swimming Headband, Phytnis Blue Size Medium( Ages 3 - 9 yrs) Swimming Headband, Doctor Recommended Swimming Headband, Best Swimming Headband for 1719 Constructed of high-strength CNC machined 6061 T6 aluminum alloy. Suitable for mountain bicycle to rise up the handlebar fork stem. Can extend the fork stem by 35mm maximumly. Easy installation, just connect up the original front fork stem.