I bought them from amazon you can see them here:

I had to buy an individual neutral density filter of 10 stops because I couldn't find it in any pack and this one is the most important one.
Now, if you don't know what filters are exactly and what to do I found a nice example. Also, I think the simplest definition of them is that they are like sunglasses for your lenses.
For example, one might wish to photograph a waterfall at a slow shutter speed to create a deliberate motion-blur effect. The photographer might determine that to obtain the desired effect, a shutter speed of ten seconds was needed. On a very bright day, there might be so much light that even at minimal film speed and a minimal aperture, the ten-second shutter speed would let in too much light, and the photo would be overexposed. In this situation, applying an appropriate neutral-density filter is the equivalent of stopping down one or more additional stops, allowing the slower shutter speed and the desired motion-blur effect.




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