Features: Precisely engineered for tn21 series cassettes recorders, this flywheel assembly guaranteeing flawlessly compatibility with the main shaft and motor group, eliminating installation misalignment or looseness for dependable performances. Featuring high strength metal for superior resistance to deformation and wear, along with precise injected plastic parts that reduce transmission noise and enhancing tape stability during operating. Designed for auditory technicians, enthusiasts, and professional maintaining or repairing tn21 cassettes recorders, this component serves as a direct, easy replacement. Utilize this flywheel assembly in your tn21 recorder to replace faulty parts, ensuring smooth tape transport, minimizing risks of jamming or fluttering, and boosting sound quality in recording and playback scenarios. With its integrated design and exact adherence to original tn21 specifications, this flywheel assembly delivers consistent reliability and improved auditory for long term use. Specifications: Component: metal Diameter:4.3cm/1.69in Suitable for the assembly and maintenance of professional auditory and video equipment, and can be widely used for home auditory and video systems. Package Includes: 1PC TN21 metal flywheel assembly note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution