[Robust Material]- Our is constructed from a high-hardness copper alloy and a PP plastic base. This combination brings about strong toughness and unmatched durability ensuring longevity for multiple uses on your rides..[Anti-slip Design]- No more slipping! The bells features an anti-slip finger pick that prevents any untimely embarrassments during your rides, making it a device during any weather conditions..[Ergonomic]- With a small, beautiful shape, our ring is comfortable to use, has a smooth round arc and does not hurt the hands. Its ergonomic design ensures optimal efficiency with minimal effort..[Crisp Sound]-This for produces a crisp ringtone with just a light touch, making it easier for you to notify others during your rides. It makes your known without being too disruptive!.[Wide Compatibility]- Versatility at its ! Our for adult is suitable for most pipe diameters (21-23mm), and comes with a hex wrench for easy installation and adjustment.