Precise Compatibility: Compatible with Philip series 5000 razor round shell S5100, S5110, S5010, S5011, S5013, S5015, S5010, S5050, S5070, S5074, S5075, S5077, S5078, S5079, S5080, S5082, S5085, S5090, , S5370/84, S5370/81, S5660/84, S5590/81, S5290/88, S5210/81 Pleasant Shaving Experience: Series 5000 replacement round shell half cutter-head is washable replacement blade with thinner screen and sharp blades. Easy to install and remove. It is more friendly to your facial skin and giving you a good shaving experience. Universal Beard Compatibility: Dual-hole design accommodates all beard lengths, ensuring smooth blade contact. SH50 blades feature self-grinding technology sharpness improves with use for long-lasting precision. Annual Replacement for Peak Performance: Replace the shaving head every 12 months to maintain optimal results. Package includes a series 5000 round shell half cutter-head (blade + frame), simplifying maintenance. Effortless Replacement Process: Remove old heads, align new ones securely, and verify positioning. Tip: If initial shave quality dips, temporarily reuse the old frame before full replacement for seamless adaptation.