This is about 2 quite large dumbbells. While the plastic that surrounds the discs looks good, the handles are made of steel with nickel plating (so they are not stainless steel). Their handle is indeed good and does not slip in the hand. The clamps seem to tighten well without loosening.
I will focus on two points:
1) The discs are quite large for dumbbells, resulting in taking up a lot of space when they are on the dumbbell, and I don't know to what extent they will be convenient for arm exercises. I have seen much smaller discs on dumbbells (especially the 5kg one is very large).
2) The fact that they are not filled with sand is positive because in the first crack from a fall, we will not have "losses".
Overall, as a set, it is good, although its price was below 80-90€