Series 5 Foil and Cutter 51S replacement pack silver. For Series 5 (older generation), ContourPro, 360°, Complete, Activator.

Short life span of these replacement cutters

I agree with the other ratings, very disappointed. It lasts MUCH, MUCH shorter than the originals. The original cutters eventually wore out the foil and lasted 18+ months. Now after 6 weeks I struggle and shaving takes much longer than it should because you need to go 4 times over an area to get a close shave. Most people will experience this. And prep time for work is limited, you eliminate things that slow you down, and this does …
Good affordable shaver though if you can fix this …

Centre of foil now looks like plastic

Just an observation really. My current foil head has a metal "comb" along the centre but the new ones shown in the photos look like plastic. If so, that could explain why they only last a few weeks instead of 18 months.