Some jingle bells.

A jingle bell is a type of bell which produces a distinctive 'jingle' sound, especially in large numbers. They find use in many areas as a percussion instrument, including the classic sleigh bell sound and morris dancing. They are typically used as a cheaper alternative to small 'classic' bells. A bell is a simple sound-making device. ... A percussion instrument can be any object which produces a sound by being struck with an implement, shaken, rubbed, scraped, or by any other action which sets the object into vibration. ... A Morris dance is a form of folk dance. ...

Jingle bells are produced from a single piece of sheet metal bent into a roughly spherical shape to contain a small ball bearing or short piece of metal rod. This method of production results in the classic two- or four-leaved shape. Sheets of stainless steel cover the Chrysler Building Thin sheets of gold leaf Sheet metal is simply metal formed into thin and flat pieces. ... A sphere is a perfectly symmetrical geometrical object. ... A 4 point contact ball bearing A ball bearing is a common type of rolling-element bearing, a kind of bearing. ...