1. NOTE: The bell has a detailed installation video, please do not use violence during installation and use,because that will cause damage to the bell and inconsistent ringing; in order to avoid scratching the bicycle, we provide a rubber strip; if the installation is loose, please tighten the hexagonal screws on the of the bell (do not overdo it, it will Affect the sound of the bell); if the bell does not work, please us, we will resend you a products. 2. This Classic Brass Bike Bell always deliver us a crisp loud tone. Pedestrians and passing vehicles can clearly hear your ringtone, which makes the riding much r. Classic Style Bell for Bike. Two different size stainless steel lock plate enable our bell fits most of Bikes. 3. Tips for Installation: Loosen the screws a little bit. It is easier to install if there's some space at the end. 4. Metal Interface; Size: 2.2cm 3cm; Weight: 50g. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.