Two sets of Remington Foil and Cutter cassette to fit the F6000, F6 model.
Also fits the later F4000, F5000, F5 shaver.
These are foil & cutter one piece cassettes. Just pop your old one off and replace it with this new one.
Your old cassette will clip out of its frame and then this new one goes in and you can fit it onto the head of the shaver.
These spares should be replaced on a regular basis for optimum performance.