Suitable for the 5000, 6000 series Philips replacement shaving heads The latest Philips shavers automatically tell you when to replace your shaving heads to maintain the best quality of your shave, which means you need replacements! The particularly thorough Super Lift & Cut technology ensures that every hair that is still too small on the skin's surface is cut off with the help of the MultiPrecision blades. Two blades are used for this, the first blade lifts the hair, while the second behind it cuts the hair directly on the skin surface. How to use: Open the shaving head and remove the retaining rings by turning counterclockwise. Remove the old shaving head and insert the new blades correctly. Then reinsert the retaining rings, turning clockwise until they click into place. Finished!