The "petal" or "horse shoe" bell is the classic cast-brass horse bell. U.S. manufacturers called them "rim" or "round" bells in the late 1800s, but these names are no longer in current use. They are known in Britain as "rumbler" bells.

The petal bell has been made by American and British craftsmen for at least 400 years and is found on all types of bell straps. In North America, petal bells vary in size from a tiny 3/4 inch in diameter to a massive 4 inches. Some British rumblers are even larger.