Spurcycle bells are beautiful to look at, and engineered to ring louder and up to 3x longer than other bells. Their philosophy is that if you can alert someone earlier, from a greater distance, you can clear your way easier. We have one in the office, it’s easy to install on most bikes, no tools required. The ring is loud and really pleasant.
They’re available in pure raw metal finish or black DLC (Diamond-like Carbon) coating.