Suitable for Multiple Classic Models: Developed for HQ56 and HQ9 series head models, suitable for HQ917, HQ916, HQ915, HQ914, HQ902, and other models. Precision structure ensures a tight fit with the shaver body, providing stable installation and restoring your shaver's performance. Value 12-Pack Bulk Set: Each pack includes 12 independent head assemblies, providing ample long-term replacement stock. Ideal for regular replacement or household backup, effectively extending shaver service life in an economical way. Efficient Precision Cutting: Adopts precision blade design paired with a rotary floating structure, adapting to facial contours to accurately capture and cut facial hair. Improves shaving efficiency for a clean and close shave. Simple Snap-On Easy Installation: Features a simple snap-on structure that requires no extra tools. You can complete head removal and installation with simple steps, saving time and effort for daily maintenance. Wear-Resistant and Corrosion-Resistant Material: Made from high-quality wear-resistant materials with high hardness and corrosion resistance. It remains sharp over long-term use, maintains stable performance, and ensures a long-lasting sharp shaving experience.