PEAK PERFORMANCE: to maintain your best shave, we recommend replacing the shaver head every 18 months ADAPTIVE SHAVING: with pressure-sensitive blades that automatically retract to protect your skin EFFICIENT & FAST: with this shaver heads 3 flexible blades SIMPLE REPLACEMENT: easily attach your new shaver head - just by clicking it on QUALITY CRAFTSMANSHIP: 100% made in Germany and compatible with Series 3 electric shavers