There is a metronome pendulum block. A metronome is a device that adjusts the rhythm and stabilizes the beat. One of the most basic piano learning aids, therefore, mastering the number of is very important and has a great effect on practicing the piano. Features - Color: Golden - Material: Metal - Size: About 1.80X1.70X0.50cm/0.71X0.67X0.20in - The material is safe and durable, which is wear resistance and practical for the long time use. - The metronome pendulum can and down, and the scale corresponding to the position of the pendulum indicates the number of per minute corresponding to the pendulum. - The replacement piano metronome sliding block is easy to install and requires no additional tools. - Changing the position of the pendulum block can change its vibration period, all a good pendulum block is very important. - Easy to install without any screws, the installation will not take up of your times, suitable for most metronomes. Package list: 1 x piano metronome slider