The Spurcycle bell is, quite frankly, the finest bell you can put on your bicycle. They are small, but ring 3x longer than other bells. Headphones are always problematic on multi use trails, but this bell gets the attention of all (expect perhaps those wearing noise cancelling models). Made from brass and stainless steel, they fit all known handlebars (even carbon!).
Get one for yourself. Get one as a gift. They’re that good.