ride cymbal

A cymbal (circular brass plate) that sits on a stand at an angle as is part of the drum kit (drum set), and is struck with drum sticks or brushes to keep a rhythmic pulse of the composition. The use of repeated rhythmic patterns created by the performer with the sticks or brushes on the ride cymbal are referred to as "riding." Other types of cymbals can be used to "ride" on, but the ride cymbals have a sound quality that can be struck continuously throughout a composition and not distract the listener from the other components of the music. 

Ride cymbals can come in thicker or thinner versions that provide the appropriate sound for certain styles of music and are typically 20 to 22 inches in diameter. A rock band may require a heavier ride cymbal for the louder music where a jazz band or combo may prefer a thinner lighter sound.