Braun Series 3 Electric Shaver Replacement Head - 21B - Compatible with Electric Razors 300s, 310s, 3010BT New in package. Reasonable offers accepted! 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 head’s 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