Quite a beast, thin and therefore not heavy but wide and therefore durable so it doesn't strain my lawnmower.

The blades are excessively sharp to the point where you are afraid to touch it to place it, it works for simple grass as well as slightly woody weeds, something that regular nylon string or star or wheel trimmers don't do because each one is made for a specific use.

--- The nylon string trims the grass by "biting" it, so it only works for thin grass.
--- The other blades don't bring as many revolutions and often cut by "banging" the weeds, making it more difficult for both the user and the machine.
--- This one cuts simply and beautifully because its sides are saw-toothed blades.

All this has to do with its price... about 5 euros! It pays for itself with the first mowing and very easily because you don't have to constantly change the nylon string and it's economical because it hardly wears out at all. It will give you many mowings until it needs to be replaced, maybe even years depending on what you are cutting. I was mowing the grass and would stop to see if it needed anything out of habit and I was happy to see the blade continue undeterred!

Obviously, you WON'T put it in a place with rocks and not very low to the ground so it doesn't hit and break.
You will see the ease it offers you if you want to mow a large area with very tall weeds.
I don't even know if it can be sharpened because the edges are saw-toothed, but for 5 euros if you think it's broken, get another one, buying one like this every year is not expensive.

Excellent disc. It cut thin grass, grass with a thickness of 2cm, grass with woody stems, and overall weeds, as well as thin branches. Because it is thin (1.6mm), it allowed the trimmer to work at lower speeds without any strain, resulting in fuel savings. Where I needed about 4 fuel refills, I only needed 1.5. I used it, as I mentioned before, on a variety of grasses and saved the cost of the trimmer line. I would say that the trimmer line I saved almost covered the cost of the disc. On the other hand, because it is thin, it requires caution with stones, iron, etc. so as not to bend (I hit a 5cm thick iron pipe and it scratched it, but it cut it without bending... I hit a wall, though, and it bent slightly at the edge...). It is important that it is 355mm, because it "shaves" a larger surface compared to most 255 or 300mm discs. Finally, with its performance, I saved a lot of time. It may seem like an exaggeration, but the reality is that a job that took ~8 hours, I finished in ~3 hours. Compared to other discs I have (3-blade with pointed ends, 3-blade with "square-straight" ends, round with 40 teeth, round with 80 teeth, and a destroyer (double-blade with bent ends downwards), it is much better for a wide variety of grasses with a thickness of up to ~3cm. I will now use it for the majority of the field and use trimmer line for the edges and near "dangerous" materials. To "cut down" thick vegetation, I will use the destroyer (not that it doesn't cut it easily, but for movement from top to bottom, the destroyer is better) and for thick branches (up to 7cm thick), the toothed round discs. For all of the above, I ordered a second one for backup...