The MM1-B Mechanical Metronome is made of plastic housing, and a clockwork mechanism has been used in this metronome. This unit’s pendulum weight is adjustable to enable the control of tempos that are between 40 and 208 bpm, while the bell is also adjustable in order to accommodate the various beat counts. Complete with a high-quality metal mechanism, this product produces a traditional beat demonstration to fit the requirements of any musician in need of precise timing.