Features: Precisely for WM F501 and WM F503 player, this gear set includes a 19 tooth and a 23 tooth gear to perfectly matching the internal drive mechanism, solving common issues like tape jamming and gear slippage for reliabled playbacks restoration. The ABS plastic gears feature exact dimensions identical to original parts, ensuring direct and easy replacement without modifications, making installation straightforward even for beginners. Ideal for vintage auditory enthusiasts and collectors, this essential maintenance component is tailored for those who own or restoring classical portable players. Use these replacement gears when maintaining or repairing your WM F501 or WM F503 player to address worn or damaged parts and ensuring smooth, uninterrupted music playback. Crafted from durability ABS these highly quality gears provide a long lasting solution to preserve the authentic performances and nostalgia of your cherished auditory device. Specifications: Component: ABS Size: 23 teeth, diameter 7.9mm; 19 teeth, diameter 6.7mm Applicable models: for WM-F501/503 Practicality: Used to replace or repair damaged gears for WM F501 503 portable auditory equipment, extending the service life of the equipment. Package Includes: 1Set Gears note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution