Metronome replacement parts are made of sturdy metal material, the surface is smooth and beautiful, not easy to , fading and paint off. Simple and convenient installation, piano metronome slider and knob are a great accessory for a piano metronome. Features -Color:Silver -Material:Metal -Size:4.20X1.90X0.50cm/1.65X0.75X0.20in -Size:1.70X1.70X0.50cm/0.67X0.67X0.20in - Made with metal materials for use, durable and practical to use, good wear resistance and strength. - Perfect replacement parts for piano metronomes, metronomes supplies can be gifted as a present to friend. - Metronome sliding block, changing the position of the pendulum block can change its vibration period. - Simple installation and user-friendly design, metronome knob and sliding block have good performances. - Metronome replacement parts are compact size, light in weight, and add more convenience for the process of installation. Package list: 1 x Metronome Sliding Block 1 x Metronome Knob