Made of material, the metronome is effective practice tool. Simply wind it up, select your desired beat and and then set the pendulum in motion. You can move the weight up and down the pendulum rod to adjust the speed. By practicing with our mechanical metronome, you can easily master rhythm skills and improve your sense of beat. It will make clear, loud sound when practicing piano, violin, guitar, bass, and other musical instruments. Feature - Color: Black. - Material: ASB and POM and PPS and iron plate. - Size: About 20.7 * 11.7 * 11cm/8.15 * 4.6 * 4.33inch(L*W*H). - Effective Practice Tool: Master rhythm skills and improve your sense of beat and by practicing with our mechanical metronome. Clear, loud sound for use when practicing piano, violin, guitar, bass, and other musical instruments. - Easy to Operate: Simply wind it up, select your desired beat and and then set the pendulum in motion. Easily move the weight up and down the pendulum rod to adjust the speed. - No battery is needed. It uses a winding mechanism for power to produce metrical . - It is Solid and Durable: Heavy enough to stay stable on a given surface and won’t tip over easily. - Accurate Musical Timing: It helps play at a proper pace, provides a firm sense of rhythm, develops finger agility and preciseness. Package list: 1 * Mechanical Metronome High Accuracy with Audible Click and Bell Ring (Black)