Features: Clear scale This product adopts metal embossed scale bar with clear scale. The scale of this product is not easy to fade. Metal pendulum rudder You can adjust the beat speed by sliding the metal pendulum rudder up and down. The nickel plating process reduces corrosion. Copper bells This product uses copper bells, which are durable. The bell is not easy to damage, its sound is clear and loud, and the beat is accurate. Metal pendulum Upgraded copper metal pendulum, copper material makes the pendulum durable. The fine craftsmanship makes the pendulum beat accurate. Robust shell This metronome adopts ABS sturdy shell. The high-strength ABS shell material makes the product more durable. Specifications: Item type: Rhythm metronome Material: Copper+ABS Color: Black Quantity: 1pc Speed: 40-208 beats/min Swing time: 30 minutes (speed 120 beats) Item size: 11*3.5*5cm/4.32*1.38*1.97inch(L*W*H) Weight: 150g/5.29oz Package: 1*Rhythm metronome 1*Package box