Good to know- Sharpen up your Philips rounded S5000, S6000 or AquaTouch series shaver with these replacement heads- The MultiPrecision blades can last up to 2 years- With a Super Lift & Cut action, these blades mean business - You can easily replace the shaver head in just a few steps ___________________________________________PLEASE NOTE: These replacements are compatible with Philips Rounded Series 5000 (rounded-shape), Series 6000 and AquaTouch Shavers. They are not compatible with the angular-shaped S5000 shavers.