Hi Gytis, You have mentioned that you keep track of the shaves and use one side only. Some of the blades doesn't have the numbers on the sides and it would be difficult to track. Can you please explain how you keep track of the shaves? do you alternate the sides on the shaves? For example if you use the side 1 today you will use the side 2 tomorrow, etc.,? If you flip the blades then the side 3 and 4 will be used in the next shaves? It would be helpful if you could give some details. Thanks for the help!