1.Discreet, Stylish & Classic Design – Designed for pretty much all road, mountain, beach cruiser, hybrid or e-bikes, whether for adults or . Fits most common bicycle handlebar sizes: 19.2 to 31.8mm - please measure handlebars before purchase to ensure compatibility and to avoid disappointment! 2.Crisp, Clear and Long Sound – High quality brass dome with sturdy striker. Powerful ring at 79 decibels with 'bright tone' for cyclists and pedestrians alike, helping others to be aware of your presence. Bell dome size 1.06 inches / 2.7cm. 3.Compact Design - Narrow design allows the bell to be neatly attached between other handlebar accessories. Can be positioned on top of the handlebars or on the front of the bars. Fits handlebar sizes: 19.2 to 31.8mm. 4.Precision & Build – Brass bell with machined aluminum alloy handlebar mount. Includes 2 O-rings so the mount can be installed quickly and fixed to different sized handlebars.