A ball includes a first housing, at least a fixing body, at least a ceramic vibration unit and a second housing. The fixing body is disposed on the internal wall of the first housing. The ceramic vibration unit is configured to make a sound and is fixed on the fixing body. The ceramic vibration unit includes a vibrating plate, a ceramic sheet and a cover body. The ceramic sheet and the cover body are disposed on the vibrating plate, and the ceramic sheet is located between the vibrating plate and the cover body. The second housing covers the first housing.