Good to know- Sharpen up your Philips S7000 or square S5000 shaver with these SH71 replacement heads- These self-sharpening steel precision blades are can last you up to 2 years- With 90,00 cutting actions a minute, these blades mean business - You can easily replace the shaver head in just a few steps ___________________Please note: These replacements are not compatible with the rounded S5000 shaver.